Keys to the Heart is a 2018 South Korean comedy-drama film directed by Choi Sung-hyun.

[2] The film stars Lee Byung-hun, Youn Yuh-jung and Park Jeong-min.

[3][4] The story of a down-and-out boxer reconnecting with his estranged, younger brother who is a gifted pianist with autism and savant syndrome.

[5][6] Yoon Min-sik of The Korea Herald called the characters and plot "generic and predictable", but praise the acting performance of the film.

[7] Shim Sun-ah of Yonhap News Agency praised Choi Seong-hyeon for handling family relationships with the utmost sensitivity, and drawing good performances out of his actors.