It's Okay To Not Be Okay
Moon Gang-tae (Kim Soo-hyun) lives with his autistic older brother Moon Sang-tae (Oh Jung-se). Each spring they move to a new city out of fear of butterflies, ever since Sang-tae witnessed their mother's murder. Gang-Tae takes up jobs as a caretaker in a psychiatric ward at every place they settle in. While working in a hospital, he meets a famous children's book writer Ko Moon-young (Seo Ye-ji), who some people suggest has antisocial personality disorder. Gang-tae begins working at the OK Psychiatric Hospital in Seongjin City, the same city where they all lived when young. Meanwhile, Ko Moon-young forms a romantic obsession for Moon Gang-tae after finding out their pasts overlapped. She follows him to Seongjin, where the trio slowly begins to heal each other's emotional wounds. As the story progresses, more is revealed of their intertwining pasts, which have been haunting them.