"Kill Me, Heal Me" is a series about the heir to a major corporation who has to hide his dissociative identity disorder from those around him. Do Hyun is a kind-hearted and lonely young man with a serious illness. He is constantly dealing with the consequences of his other personalities' actions, from the brutal playboy Se Gi to the eccentric teenage girl Yo Na. One day, fate brings him together with psychiatrist Ri Jin, and he once again has hope for a normal life.