A traumatic childhood experience causes third-generation chaebol Cha Do-hyun to have memory lapses, and his personality fractures into seven different identities. He is treated secretly by Oh Ri-jin, a first-year psychiatry resident, who eventually falls in love with one of his personalities.

A love story between the son from a wealthy family who has 7 personalities and a 1st year female resident who becomes a secret doctor for him.