Kill Me, Heal Me: Season 1, Episode 1

1 - 1: I don’t even know yet…how many persons are there living inside me.

Cha Do-hyun is in line to be the successor of Seungjin Group. No one in his family is aware that he's been suffering from dissociative identity disorder for years following a family tragedy. Oh Ri-jin is a first-year psychiatric student who runs into one of Do-hyun's many personalities while looking for one of her patients.