Osman began his journey by forming a friendship with Yorgopolos and the Kayi tribe expanded its influence further during the reign of Osman Ghazi, but some problems will hinder Osman and he must solve it.

The appearance of Adbali and his daughter, Bamsi bid farewell to his son Ibars, while sedition began to appear in the horizon between the Kayi tribe and the castle after the killing of Yorgopolos and Sofia accused Osman of killing him.

Seeing Helen and Sofia running down the aisle, Kalanoz went after her, suspecting her murder partner, Sofia, of getting involved in other things. Osman captured Teokles and the front of Theebali was blocked by Akca Dervis, Pehlivan and Zulfikar Dervis. After the trio, Bala Hatun took Osman to Edebali. I wonder what Edebali will tell Osman. What kind of plan will Dundar and Batur plan to plan for Dundar, whose daughter was kidnapped, and Zohre, who saw Osman as responsible for these events? What's the big surprise waiting for Kalanoz, who's going after Sofia and Helen.

Bala Hatun is kidnapped. Osman is imprisoned in a tent with his hands chained. Learning about Bala Hatun's abduction and outraged Osman's actions surprise everyone.

Yannis succeeded in realizing his bloody plan, raiding the market by the lake and kidnapping Edebali's daughter.

Osman took Bala Hatun's healing from Yannis and exposed Yannis.

Batur, Dündar's son, rescues Osman for a reputation in the tribe after one of Salvador's men is tricked. Edebali declines Osman's proposal leaving him devastated and upset.

Sofia tasks her lover, Kalanoz, to kill Şeyh Edebali but is killed in this attempt by Osman. Bamsı, Osman's loyal companion, converts Salvador to Islam. Salvador's new name is Sıddık.

Osman steals all the tax gold that was being transported illegally to Alişar Bey, the Selçuk Sançak Bey, by the Mongols. Yannis, disguised as a clairvoyant, proves to Alişar that Osman stole the gold. Alişar becomes an enemy of Osman.

Balgay, a Mongol commander, captures Söğüt and kills many women and children. He offers Osman that he will give him the Sançak Beylik and some more land if he was to become loyal to him. Osman rejects Balgay's offer.

Tekfur Alexis of İnegöl seeks revenge on the Kayı tribe for conquering Kulucahisar. He invades a caravan of the Kayı tribe, Osman, takes his revenge by defeating him in a battle. After the battle, the Emperor, concerned over the Turk threat on his empire, sends Aya Nikola to İnegöl Castle. Nikola kills Alexis for his failure and snatches the castle from him. Nikola also frees an old friend from prison, Flatyos. Ertuğrul also later returns towards the end after a year in Konya.

Nikola arrives in the nomad camp and claims he wants peace while Osman thinks he is about to meet his father but falls into an ambush set by Yavlak Arslan, Hazal Hatun's brother. Meanwhile, Osman's elder brother, Savcı, also returns from Crimea. Ertuğrul goes to meet Arslan Bey of the Çobanoğlu tribe and warns him not to become a traitor as he's dealt with them his whole life. Osman, who escapes Arslan's ambush, ambushes him and Geyhatu's son, Möngke's camp. However, Arslan and Möngke escape.

Arslan tasks Cerkutay, who is alive, to go to Geyhatu, who already hates him because of him being loyal to Balgay, and tell him that Osman captured Möngke. Geyhatu, who is in Konya planning to kill his brother, Argun, is angered over this and allows Cerkutay to live if he is loyal to him. Meanwhile, Söğüt perishes due to the disease spread by Flatyos on the orders of Nikola followed by an explosion done by the same people.

The relations between Savcı and Osman become tenser, Osman is angered when Ertuğrul sends Savcı to explain to Geyhatu that Osman didn't kidnap Möngke. When Savcı arrives at Geyhatu's camp, he is given only a few days to find Möngke otherwise his tribe will be destroyed. After Savcı tricks one of Cerkutay's men into telling him Möngke's location, he falls into Möngke and Arslan's trap and is captured. Möngke seeks to kill his father to become the Viceroy and then the Great Han while pinning the blame on Osman.

The time period given by Geyhatu ends and Geyhatu arrives in Osman's tribe. Osman saves Savcı and he returns to the tribe with the captured Möngke. Ertuğrul continues to stay on his death bed.

Möngke's treachery is proven after he is forced to reveal the truth, however, he doesn't manage to say the truth about Arslan thus Arslan survives and Möngke is killed by Geyhatu. In the meantime, Aya Nikola and Flatyos successfully capture Kulucahisar Castle.

Osman is alerted that a distant Cuman Turk tribe has been invaded by the Emperor and the Bey's daughter, Targun, is being taken captive. Osman rescues Targun and takes her to the tribe. However, Targun is betraying Osman, she spies for Aya Nikola to save her father, İnal Bey, who is in Aya Nikola's captive. Hazal also teases Bala that Targun was brought by Osman because he wanted to marry her for a child which she couldn't produce.

After Nikola is stabbed by Osman, Flatyos attempts to take revenge on Osman with a gunpowder plot on Söğüt. Osman however, is aware of the attack and Flatyos' plans backfire. Flatyos is captured and is taken to Kulucahisar where the "incompetent" Dündar and Savcı are saved by Osman who were about to be beheaded by Nikola.

Targun goes to meet her father at Kulucahisar but is spotted, when she returns, Osman captures her and she is forced to tell the truth. Osman vows to help her save her father and also decides to marry her after Bala says that he needs an heir to become the Bey. He also attacks Kulucahisar while Nikola goes to meet Arslan at the Çobanoğlu tribe.

Osman reconquers Kulucahisar, although İnal Bey is taken by Nikola's knights to İnegöl. Bala and Targun's relations tensen a little and Dündar's evil plans are also revealed, he seeks to become the Bey of the tribe.

Osman Bey establishes his headquarters in Yenişehir, acting on crucial information from his spy in Constantinople. He faces threats from Northern warriors Olof and Frigg. Bala Hatun and Malhun Hatun prepare for a market in Yenişehir, leading to tensions between Bengi Hatun and Malhun Hatun. The competition between Aktemur and Alçiçek adds to the growing tension.

Osman Bey thwarts Kantakouzenos' plans in Constantinople, but the cunning strategist persists in his game. Kantakouzenos initiates a new strategy, enlisting Olof's aid as the first step. Olof, driven by revenge for his brother Saga, arrives in Yenişehir with his men at Kantakouzenos' behest. Their goal is to besiege Osman Bey, plotting to attack him from both external and internal fronts.

Olof's personal stake in Yenişehir drives him to take risks, while his lover Frigg poses a threat to Malhun Hatun. In Constantinople, Kantakouzenos involves Ofelia, further complicating matters. Osman Bey takes on the responsibility of confronting and resolving the chaos, arranging a meeting with Olof in the arena.

Osman Bey is ambushed by Olof, revealing a larger scheme involving the kidnapping of his sons and false accusations against Öktem Bey. Ofelia is suspected as the prime culprit. Emperor Andronikos orders Olof to kill Osman Bey and his daughter, Ophelia, escalating the danger for the family.

The attack on Aktemur has greatly shaken Osman Bey's trust, leading him to establish a court to address the situation. Both Öktem Bey, who is accused of stealing gold, and his daughter, Alçiçek Hatun, who injured Aktemur Bey, will face trial. Osman Bey's decision to establish a court signifies his commitment to ensuring justice is served in these matters.

Osman Bey and his soldiers are trapped in a mine after Olof discovers their hiding place. Their survival is uncertain, causing growing concern. Malhun Hatun urges Bala Hatun and the soldiers to rescue Osman Bey. The main question now is how they will escape the mine and overcome the imminent danger.

Ismihan Sultan opposes Osman Bey's ambitions in Yenişehir. The control of the Marmaracik Citadel is contested. Osman Bey battles self-doubt while planning to conquer Köprühisar. Olof seeks new tactics after losing to Osman Bey. Intrigue and developments continue to unfold.

Osman Bey remains determined to conquer Köprühisar and is willing to take risks to achieve his goals. However, complications arise in the love story between Aktemur and Alçiçek, as Bayındır becomes an obstacle. Ismihan Sultan grows uneasy about Osman's ongoing conquests. Conflicts and challenges arise as Osman's ambitions clash with the desires of those around him.

Tensions escalate as Ismihan Sultan exposes Osman Bey's headquarters and plans. She seeks to hold him accountable and employs various strategies, including attacks by Olof and Frigg. Ismihan Sultan aims to isolate Osman Bey, seize his principality, and claim his properties. The conflict intensifies as they both strive to protect their interests and maintain their positions.

Osman Bey and his Alps attempt to capture İnegöl castle from Turgut Bey, but face opposition from Turgut Bey, Kantakouzenos, and Ismihan Sultan. Negotiations ensue, with Osman Bey demanding the castles acquired through sacrifice. Olof plans to meet with Ismihan Sultan. Meanwhile, Osman Bey works to install Sultan Mesud on the throne, unaware that Konya has been handed over to a Mongol commander.

Years after the Bapheus victory, Osman Bey's children have become beys. As Osman Bey continues his conquest for Bursa, news arrives that Sultan Mesud has been poisoned, sparking a power struggle for the Sultanate. Bala Hatun, grieving the loss of her child, battles a serious illness. Germiyanoğlu Yakup Bey, who set up a market on the Yenişehir-Germiyan border, survives an assassination attempt marked by a Kayı, raising tensions with Osman Bey. Vasilis, a hidden enemy, plots to revive Rome amid the search for a new sultan. Osman Bey sends his son, Alaeddin Bey, to Konya following the poisoning news, where Yakup Bey’s daughter also arrives, with Yakup Bey aiming for the Sultanate. In weakened Konya, irregulars settle in Uçlar. Orhan Bey invites these Sancaksız irregulars to join Osman Bey’s holy war, and this news reaches Yakup Bey’s son, Mehmet. Amidst these events, poet Yunus Emre arrives in Yenişehir, potentially influencing Osman Bey's spiritual life.

Yakup Bey confronts Osman Bey, demanding his allegiance. Cerkutay returns to Yenişehir Palace, creating a festive atmosphere but harbors anger towards Osman Bey. Yakup Bey puts Osman Bey in a difficult position with his Lefke move, but Osman Bey intends to outmaneuver him, knowing Yakup Bey's true intentions. Meanwhile, tension rises between Mehmet and Orhan over Holofira, who wants to return to her homeland but faces opposition from Orhan. Gonca seeks a treasure map from Alaeddin Bey, leading to their confrontation at the caravanserai. Alaeddin reunites with his mother, Bala Hatun, who informs him of Yakup Bey's demand for allegiance from Osman Bey. Saadet Hatun arrives in Uç Pazar and reacts strongly upon learning of the assassination attempt on her husband, Yakup Bey. Osman Bey plans to host all the beys and Yakup Bey in his palace, but the real outcome of their tension is yet to unfold.

Osman Bey believes Sultan Mesud's treasure is the key to ending Yakup Bey's dominance. He tasks Orhan Bey with finding the treasure and Alaeddin Bey with monitoring Yakup Bey. Learning of the treasure, Yakup Bey is determined to claim it for power, setting the stage for a race between the two factions. As Orhan searches for the treasure, he crosses paths with Holofira, while Mehmet Bey, under his father's orders, plans to seize it, creating tension between him and Orhan. Meanwhile, Alaeddin's surveillance of Yakup leads to a personal moment with Gonca Hatun, where he questions her feelings for him. Elsewhere, Osman confronts the Sancaksız people for their actions, while tensions rise between Malhun Hatun and Saadet Hatun in the Uc Pazar, where Yakup appoints Cerkutay as patron. Osman and Bala Hatun travel to address unrest, unexpectedly encountering Yakup Bey, who claims the area as Germiyan's property, further escalating their rivalry over power and the treasure.

Yakup Bey conquered Lefke Castle before Osman Bey and claimed to give it to him, but Osman Bey suspects Yakup Bey's intentions. A new enemy, Master Gera, arrives at the Edges. Disguised as a merchant, he meets Osman Bey, who invites him to Yenişehir. Master Gera's arrival brings chaos, and he plans to kill Boran Bey, Osman's trusted man. Malhun Hatun, aware of Saadet Hatun's grudge, plans a significant move against her. Meanwhile, Orhan Bey, disguised as a Mongol, takes a treasure and shoots Mehmet Bey, leaving his fate uncertain. Finally, Yakup Bey confronts Osman Bey, asking for allegiance one last time, and Osman Bey must decide his response.

Osman Bey plans to unite against the Mongols by paying their tax and gathering an army with Yakup Bey. Despite the raid on Yenişehir Palace and the stolen treasury, he remains determined. Tensions rise among the women as Malhun Hatun and Saadet Hatun clash, with Bala Hatun joining in. Saadet Hatun targets Holofira to undermine Orhan, while Bala Hatun worries about her son Alaeddin's involvement with Gonca. Cerkutay visits the injured Boran Bey, hoping to mend relations with Osman Bey and the Alps. Orhan Bey finds the stolen treasure at Bayındır Bey's place, leading to an execution order for Bayındır Bey. Master Gera causes chaos in Söğüt, starting a fire that Alaeddin Bey and Bala Hatun must extinguish. Osman Bey faces unexpected challenges from the Mongol Commander while trying to pay the tax.

Osman Bey and his alps escape from the Mongols and plan a counter-raid. News of a raid on Söğüt spreads, causing alarm. Malhun Hatun plans to counter Yakup Bey, who might exploit Osman Bey's absence. Orhan Bey is unhappy seeing Holofira in the market, and Malhun Hatun warns him about trusting Byzantium. Saadet Hatun wants Holofira as her bride and influences Gonca Hatun to tie Alaeddin to Yakup Bey. Tensions rise as Orhan Bey opposes Yakup Bey's control over Yenişehir. Yakup Bey prepares for conquests, placing his son Mehmet Bey in command, which Orhan Bey disapproves of. Danger approaches the cave where Osman Bey and his alps take shelter. Mehmet Bey and Orhan's tension escalates during their conquest, with Mehmet ordering Orhan's assassination, but unexpected events unfold. Osman Bey remains determined to resist threats to his rule, declaring his resolve for freedom.

Osman Bey and Yakup Bey rush to Kestel to rescue their captive children, Orhan and Mehmet. The Tekfur of Kestel demands castles in exchange for their release. Yakup Bey agrees, but Osman Bey opposes, aiming to rescue the children and conquer Kestel. Yakup Bey blames Osman for Mehmet's capture, urging him to find the palace traitor. Alaeddin informs Malhun Hatun that Holofira is the traitor, possibly influenced by Vasilis. Orhan and Mehmet endure torture in Kestel Castle, unaware that Master Gera is behind Tekfur Makranos. Bala Hatun confronts Saadet Hatun, refusing to surrender the castles and imprisoning Saadet and Gonca. Yakup Bey negotiates with the Tekfur, potentially defying Osman Bey's stance. The situation escalates as Osman Bey must decide his next move.

Karacelasun seeks vengeance for his brother and meets Master Gera, considering an alliance. Orhan Bey and Holofira's love grows, but Malhun Hatun upsets Holofira. Alaeddin Bey and Gonca Hatun clash, and Karacelasun raids the Uch Bazaar, angering Mehmet Bey who blames Osman Bey. Osman Bey, aware of danger, remains steadfast. Yakup Bey and the Turkmen Beys meet, refusing to let the Mongols or Byzantines prevail. Osman Bey knows the Mongols and Turkmen Beys are after him and Yakup Bey. Yakup Bey’s life is in danger. Osman Bey and his alps face traps trying to save Yakup Bey from Karacelasun's ambush. The outcome remains uncertain.

Osman Bey rescues Yakup Bey from Karacelasun, emphasizing his commitment to Islam. Karacelasun seeks revenge with a new plan against Osman Bey, who assigns Orhan Bey to thwart him. Gonca Hatun's condition worsens, prompting Alaeddin and Mehmet to search for a cure. They encounter Crusader soldiers, and Yakup Bey, aware of Gonca's condition, vows to hold the Mongols and the Kayı accountable if she suffers. Alaeddin Bey struggles to find a cure for the poisoned victims in Uç Pazar, growing increasingly desperate. Cerkutay, in anguish, holds his poisoned child, with Ülgen Hatun also deeply affected. Yakup Bey manipulates Cerkutay against Osman Bey, blaming him for their misfortunes. Vasilis, revealed as a traitor, takes refuge with Yakup Bey, accusing Osman Bey of deceit. Yakup Bey, enraged, plans to hold Osman Bey accountable, escalating the tension between them.

Karacelasun seeks revenge and allies with Master Gera to kill Osman Bey's son, Alaeddin. Bala Hatun, learning of Alaeddin's capture, confronts Saadet Hatun at Uç Pazar. Karacelasun encounters Orhan Bey in a fight, but Osman Bey appears, cornering him. Orhan Bey declares his desire to marry Holofira, and Malhun Hatun explains the sacrifices required to be a Bey's lady. Orhan Bey and Alaeddin Bey capture Vasilis, and Yakup Bey reacts to Vasilis' escape from Uç Pazar. Alaeddin Bey faces an attack in his tent, putting his life in danger. The tension between Osman Bey and Yakup Bey continues, with Yakup Bey keeping the Sancaksızlar’s secret. Orhan Bey, seeing Mehmet Bey give Holofira a ring, takes her away on his horse. Osman Bey hosts all the Beys in Yenişehir to address their grievances, closing the gates while they are inside. This move's purpose remains uncertain, as does whether it will clear him of suspicion.

Osman Bey, now leading a state, aims to unify the Turks under his banner, and influence border principalities. Bayhan Bey and his rival Begüm Hatun attend Osman Bey's wedding, possibly revealing intentions towards his daughter, Fatma Hatun. The arrival of the Caliph's vizier Emir Ömer stirs tension, his purpose unknown to Osman. Emir Ömer secretly informs Karesi Bey of the theft of sacred relics, prompting Karesi to seek them out and offer allegiance to Osman Bey. As Osman expands his territory, Byzantine hopes rest on Commander Lucas, who holds the sacred relics and plots against the Turks. Lucas tries to recruit Holofira, impacting her and Orhan Bey’s paths. Alaeddin Bey is imprisoned in a castle as Osman continues his conquests, facing Lucas's schemes.

Despite numerous challenges, Karadin Castle becomes Kayı property. Alaeddin Bey is exposed to danger during the conquest. Commander Lucas devises a plan to find and exploit the weaknesses of Osman Bey and Karesi Bey, aiming to set them against each other. Lucas, holding sacred relics, plans to use them as leverage. Osman Bey's tribe is alarmed when the relics are stolen, and he confronts Lucas. The fight for Karadin Castle ensues with Begüm Hatun and Bayhan Bey vying for control, while Bala Hatun remains disinterested. Holofira, under Lucas's orders, arrives uninvited at the celebration, rekindling her love with Orhan Bey, who proposes marriage. Saruca and Yusuf compete for Fatma Hatun's affection. During Gonca Hatun's difficult childbirth, Begüm and Hazal Hatun clash, with Begüm accusing Hazal of poisoning her.

Osman Bey's pledge to protect the sacred Islamic relics elates the Kayı tribe but fuels Karesi Bey's jealousy. To thwart Osman, Lucas sets a trap in Karadin, complicating Begüm Hatun's situation. After her setback, Begüm plots to undermine Bala Hatun. Meanwhile, it's revealed that Cecilia poisoned Gonca Hatun, straining her relationship with Holofira. Orhan Bey devises a plan to kidnap Holofira from her arranged marriage, but they encounter a trap. Lucas and Karesi plan to financially damage Osman by building a bridge. Osman discovers Karesi's deceit. The unfolding drama sees Gonca's feelings towards Holofira change, and the possibility of Orhan and Holofira's reunion.

Osman Bey's escape angers Lucas and Karesi Bey, who plan a new move against him. During a wedding in Kayı Oba, Lucas incites a Greek rebellion in Söğüt, shocking everyone. Lucas also pressures Karadin Castle, putting Osman Bey in a tight spot as he deals with both threats. Osman Bey escapes a trap, while Orhan Bey and Holofira face danger from Lucas' men. With no obstacles left, Osman Bey plans a grand wedding for Orhan and Holofira. Tensions rise between Gonca Hatun and Holofira due to lingering pain. Begüm and Hazal Hatun notice the strain and may exploit it. Gonca Hatun considers leaving Kayı Oba with Alaeddin Bey. Yusuf and Saruca vie for Fatma Hatun's affection, leading to a showdown between them.

Osman Bey rewards Karesi Bey with Karadin Castle for thwarting Lucas's plan to capture it, initiating trade despite Karesi Bey's potential hidden motives. Meanwhile, Osman Bey tackles the escalating Greek Rebellion in Söğüt, aiming to restore peace by targeting its leader, Arcadeus. Sofia teams up with Lucas to seek revenge, severely injuring Baysungur, pushing Osman Bey to focus on avenging him. In the Kayı Obası, tensions rise between Gonca Hatun and Holofira, drawing Hazal and Begüm Hatun into the conflict. Bala Hatun intervenes with impactful warnings, while her strained relationship with Begüm Hatun adds to the discord.

Osman Bey prepares to strike Byzantium and Karesi Bey by targeting Akhisar, while Karesi Bey enforces martial law in Karadin to strengthen his grip. As Osman Bey focuses on his conquest, Bala Hatun works to maintain peace amidst rising tensions between Gonca and Holofira, further aggravated by Begüm Hatun. Meanwhile, Sofia creates turmoil by kidnapping Fatma, Saruca, and Yusuf, shocking Söğüt Pazar. Bala Hatun swiftly takes action to rescue Fatma and restore order.

Osman Bey is deeply disturbed by the kidnapping of Fatma Hatun, Saruca, and Yusuf by Lucas and Sofia, who demand Söğüt in exchange for Fatma. Though appearing to surrender, Osman Bey devises a plan to rescue her without losing Söğüt. Meanwhile, Karesi Bey, sensing Osman Bey's vulnerability, declares war and allies with Gencer Bey to strike. Lucas manipulates Yusuf and Saruca to uncover Osman Bey's strategies, testing the loyalty of Begüm Hatun and Bayhan Bey. Amid rising tensions, Orhan and Alaeddin take great risks to rescue Fatma, further intensifying the conflicts.

Sofia seeks revenge on the Kayis by orchestrating a deadly trap, endangering Bala Hatun and leaving Gonca Hatun and Holofira's fates uncertain. Lucas suspects a traitor in their ranks and uncovers Ilbay, who faces the threat of execution. Tensions rise as Boran and Cerkutay blame Begüm Hatun and Yusuf for their struggles, further fueled by Begüm's disruptive actions in the council and market. Bala Hatun steps in to address the escalating discord, while Gonca Hatun must navigate the delicate revelation of Begüm Hatun's love for Osman Bey.

Osman Bey seeks justice for the attack on Bala Hatun and his family, while Sofia sets a trap involving Osman’s long-lost daughter Halime, whom she raised as an enemy. Tensions rise as Poena unknowingly attacks her sister Fatma at Söğüt Market. Suspecting Gencer, Begüm, or Bayhan as traitors aiding Lucas, Sofia, and Karesi, Osman monitors them closely. After discovering Begüm Hatun's meeting with Karesi Bey, he imprisons her, but she escapes and seeks refuge with Karesi, who proposes to her. Osman tracks Begüm's kidnapper, confronts Karesi Bey, and blood is shed in the process. Amid all this, Osman Bey is determined to protect his family and take revenge against Lucas and Sofia's growing threats.

Osman Bey, wounded by Poena’s arrow while seeking Sofia’s hidden secrets, remains resolute in defeating Sofia and Lucas, who scramble to escape while managing Poena. Sofia plans to use Poena to infiltrate the Kayı Tribe and target Osman Bey and Bala Hatun. During Bala Hatun's visit to Halime's grave, Poena attempts to kill her. Amidst growing tensions, Karesi Bey declares war on Osman Bey with Lucas’s support, while Begüm Hatun risks her life by warning Osman of Karesi’s plans. Sofia and Lucas launch an attack on Osman’s headquarters, threatening Bayhan Bey’s life and impacting the war’s outcome. Osman Bey must face Karesi’s alliances and stand alone against mounting threats.