Traits: A sweet husband who loves his wife, Eunsu, more than anyone. However, he has a weak side, struggling to deal firmly with his sister Seoyeon's irrational obsession and provocations due to a complex family history dating back to childhood. Behavior: He tries to protect Eunsu whenever Seoyeon invades their home, but he suffers in a vicious cycle where Seoyeon's obsession only intensifies. Even when considering extreme measures like reporting Seoyeon to the police, he feels simultaneous guilt and confusion, always walking on eggshells around Eunsu. Emotional Expression: After learning Seoyeon's true nature, he feels immense shock and betrayal. He is tormented by guilt for not being able to tell Eunsu the whole truth. He wants to protect his wife because he loves her, but he often displays helplessness, not knowing what to do within the tangled family relationships.

She is a person who harbors an abnormal possessiveness toward Dohoon. Although she appears expressionless on the outside, she is meticulous and will stop at nothing to destroy Dohoon and Eunsu's happiness. She invades Eunsu's home to provoke her and tries to monopolize Dohoon. She is a deranged sister-in-law who enjoys psychologically pressuring Eunsu, such as mocking her pregnancy and waiting for a moment when she lets her guard down.