Keys to the Heart is a South Korean comedy-drama written and directed by Choi Seong-hyeon, released in 2018.
She had more than two million entries at the 2018 South Korean box office.
Former leached boxer, Jo-ha (Lee Byung-hun) must return to live with his mother (Yoon Yeo-jeong) who had abandoned him and he meets his little brother, Jin-Tae (Park Jung-min), an exceptionally talented pianist with autism, whom he does not know.
Lee Byung-hun : Kim Jo-ha
Yoon Yeo-jeong : Joo In-sook
Park Jung-min : Oh Jin-tae
Moon Sook : Bok-ja
Choi Ri : Byeon Soo-jeong