S1 E1 I don’t even know yet… how many persons are there living inside me.
Cha Dohyeon 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 Rijin is a first-year psychiatric student who runs into one of Dohyeon's many personalities while looking for one of her patients.