Suamiku Direbut Adikku

Soo-a and Seo-jun have been married for three years. On their wedding anniversary, Soo-a discovers that her younger sister, Eun-a, has returned from abroad and is in bed with Seo-jun. Shocked and devastated, Soo-a demands a divorce and returns to her position as the head of the Madly Group. As she begins to take revenge on Eun-a and those who tormented her, she gradually clears up the deep misunderstandings between herself and Seo-jun.