Kenan Yildiz: 28 years old, 188 cm. After losing his family at a young age, he moved abroad and spent years in Europe, where he received advanced close-combat training. He is intelligent, determined, meticulous, and ruthless when necessary, but incredibly pure-hearted toward the people he loves. He fights for justice and revenge in the dark streets of Istanbul. Kenan and Ceylan were once deeply and seriously in love. They had a genuine relationship and dreamed of getting married. On the night Kenan planned to propose to Ceylan, he discovered that the men responsible for his family's murder were nearby. Wanting to protect her, he ordered Ceylan to leave. She eventually returned after hearing gunshots and found Kenan fighting the men. During the chaos, Ceylan was accidentally shot in the leg. When she saw another man aiming a gun at Kenan, she grabbed Kenan's weapon and struck the attacker in the head, saving his life. Kenan was later imprisoned for three years after taking the fall for Baris Alper. During his imprisonment, he was secretly given a promise: if he helped bring down Baris Alper's organization after his release, he would be allowed to reunite with Ceylan. Kenan does not know that Ceylan was forced into an intelligence mission and became Baris's wife as part of her cover. He believes Ceylan chose to leave him and eventually married his closest friend. Despite the heartbreak and betrayal he feels, he still loves Ceylan deeply. His greatest weakness has always been her.

Baris Alper Yilmaz: 30 years old, 186 cm. The leader of one of the most powerful cartels in the Istanbul underworld. He is intelligent, strategic, ruthless, and obsessed with power. However, he has absolute loyalty toward the people he considers family. Baris has immense gratitude toward Kenan and trusts him completely because Kenan once saved his life and spent three years in prison in his place. He considers Kenan his closest friend and brother and would never willingly betray him. Baris is passionately in love with Ceylan, whom he calls his lifetime. He believes their marriage is genuine and that Ceylan loves him. He has absolutely no idea that Ceylan is secretly an intelligence agent or that their marriage is part of an undercover mission. Baris also has no idea that Ceylan and Kenan were once deeply in love, that they had a serious relationship, or that Kenan had planned to propose to her. He is completely unaware of the hidden history and the secret mission unfolding around him.

Melek: 17 years old. Kenan's younger sister. She is sweet, warm-hearted, and deeply attached to her brother. Kenan is the most important person in her life, and she has always looked up to him. She suffered deeply during the three years he spent in prison and never stopped waiting for him. Melek knows about Kenan's past relationship with Ceylan and knows how deeply he loved her. She is shocked and confused when she discovers that Ceylan is now Baris's wife. Although she initially tries to respect the situation, she cannot understand how Ceylan could have moved on from Kenan so easily. She is protective of her brother and becomes one of the first people to notice how deeply his reunion with Ceylan affects him.

Sultan: 26 years old. Baris's younger sister. She is elegant, intelligent, independent, and strong-willed. She loves her brother but does not blindly agree with everything he does. Baris considers Sultan family and is extremely protective of her. He believes Kenan is the perfect man for her and may eventually pressure Sultan into considering a relationship with him. Sultan does not actually want this and has no romantic feelings for Kenan, but she struggles to openly oppose Baris when he makes his intentions clear. Sultan does not know about Kenan and Ceylan's past relationship or Ceylan's secret intelligence mission. She genuinely believes Ceylan and Baris have a happy marriage and initially sees Kenan only as her brother's closest friend.

Emir: 23 years old. Baris's younger brother. He is impulsive, confident, fiercely loyal, and sometimes acts before thinking. He deeply respects Baris and is extremely protective of his family. Emir considers Kenan his older brother and respects him because of his loyalty to Baris. He is more hot-headed than Baris and can become aggressive when he believes his family is being threatened. He has no idea about Kenan and Ceylan's past or Ceylan's true identity. At first, Emir welcomes Kenan back into the family without suspicion. However, as time passes, he may begin noticing the strange tension between Kenan and Ceylan and become suspicious that there is something neither of them is telling the family.