<Li> Kim Amy as child Oh Ri - jin (Cha Do - hyun) </Li> <Dl> <Dd> Oh Ri - on's twin sister . A first - year psychiatry resident who tries hard to maintain her seemingly perfect image to cover for her real personality . At first glance, she looks elegant and gentle, but she is actually messy and short - tempered . Ri - jin then becomes Do - hyun's secret psychiatrist, and slowly falls in love with him . In Episode 16, it was revealed that Cha Do - hyun is her real name . </Dd> </Dl> <Dd> Oh Ri - on's twin sister . A first - year psychiatry resident who tries hard to maintain her seemingly perfect image to cover for her real personality . At first glance, she looks elegant and gentle, but she is actually messy and short - tempered . Ri - jin then becomes Do - hyun's secret psychiatrist, and slowly falls in love with him . In Episode 16, it was revealed that Cha Do - hyun is her real name . </Dd> <Ul> <Li> Park Seo - joon as Oh Ri - on (Omega / Oh Hwi) <Ul> <Li> Kim Ye - joon as child Oh Ri - on </Li> </Ul> </Li> </Ul>

Cast of kill me heal me korean drama