Season 2

After saving Osman Bey from Aya Nikola, Malhun arrives in the Kayı tribe. Malhun tells Osman that she is trying to find a place for her tribe to reside which results in Osman giving her some land in Bithynia. Malhun decides to help Osman find the traitors in the Kayı but, not trusting Osman Bey, she doesn't tell Osman when she finds Dündar's ring at the same place where the traitor İdris was killed by the more powerful traitor who wanted to cover up his tracks. She is wounded by Togay and later captured by Nikola, although later freed. She is eventually subjected to Osman's anger for hiding the ring after her father gives it to Osman. She later regrets hiding the ring and seemingly develops feelings for Osman Bey, troubling her father. Osman then initiates a major battle with the Byzantines, with the support of Malhun Hatun which is historically known as the Battle of Domanic ^[3] She later marries Osman after he is advised by Edebali to marry another woman to get heir for his beylik and becomes pregnant soon after - giving birth to Osman's eldest son, Orhan.

Season 3

Malhun, who learns that Bala Hatun is pregnant, engages in a power struggle with Bala and the conflict between the two hatuns also seemingly affects the people of the tribe. But Selcan Hatun puts an end to any further conflicts by advising all the hatuns of the tribe to work amicably but reminds them that, there can only be one head hatun, which is Bala Hatun. Their relationship takes a turn for the better, when Malhun Hatun decides to entrust Orhan to Bala Hatun, while she accompanies Osman Bey and his alps on his conquest.

When the Kayi tribe is targeted by the Seljuk Vizier, Alamshah, Osman is framed for an assassination attempt on Sultan Mesud. Due to this, Gunduz Bey, Osman's brother, becomes the acting Bey of the tribe. He falls under Alamshah's influence and exiles Malhun, Bala and Selcan Hatun from the tribe - separating Malhun from Orhan. She later sneaks into the tribe with Aygul Hatun and takes him back and stands headstrongly against Gunduz and Alamshah, Osman eventually clears his name and they are all able to return to the tribe. However, tragedy strikes for Malhun as her father, Omer Bey, along with his loyal soldiers are secretly killed in a massacre by Barkin Bey, a traitorous bey who is engaged to Malhun's cousin, Selvi Hatun. She buries her father and vows to find his killers.

Several years have passed and Osman's strength and power has heightened with time. Orhan and Alaeddin Ali are kidnapped to lure Osman into a trap but Malhun works with Osman and Bala to rescue them from Bilicek Castle - which is later conquered. However, the same day Osman returns from Bilicek, victorious, is the same day Osman's adoptive mother, Selcan Hatun, dies - leaving everyone devastated. While the preparations for the Inegol conquest are underway, Osman's daughter Fatma who was sent to the highlands, returns to the tribe to the joy of her close ones.