Keys to the Heart

Keys to the Heart is a 2018 South Korean comedy-drama film directed by Choi Sung-hyun. The film stars Lee Byung-hun, Youn Yuh-jung and Park Jung-min.
Plot.
The story of a down-and-out boxer reconnecting with his estranged, younger brother who is a gifted pianist with savant syndrome.
Production.
Principal photography began on June 6, 2017 and ended on August 27, 2017.
Reception.
Critical reception.
Yoon Min-sik of "The Korea Herald" called the characters and plot "generic and predictable", but praise the acting performance of the film.
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.
Box office.
According to figures provided by the Korean Film Council, just 3 weeks after its release, the film had surpassed 3 million viewers.
Music Pieces.
The following music pieces appeared in the film: