I will give you the story of Just a cheater here.... So basically Taekook are a married couple in love but things change when Jimin enters the scene. Jimin is an old crush of JK and also his boss but Jimin is in love with JK and wants to separate TK. JK's parents have abandoned him due to his marriage with Tae and JK struggles to perceive his singing passion and earn money. Jimin tries to take advantage of this and confesses to him. Soon JK's behavior changes and Tae realises there is trouble in paradise before one day when he sees them hugging in Jimin's cabin. Tae confronts JK later on and JK seeks divorce. After that JK is hated by literally everyone including readers. Tae even tries to commit suicide but is saved... JK comes to visit him and just says one thing while Tae is unconscious that he will always love him. Few years later Tae becomes successful and decides to marry Park Seo Joon his college senior who was always in love with him. On the day of the wedding JK calls Jin asking for Tae, but Jin insults him and refuses to pass the phone.