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 Jeong-min.

Plot
The story of a down-and-out boxer reconnecting with his estranged, younger brother who is a gifted pianist with Autism and Savant Syndrome.

Cast

 * Lee Byung-hun as Jo-ha
 * Park Sang-hoon as young Jo-ha
 * Youn Yuh-jung as In-sook
 * Park Jeong-min as Jin-tae
 * Han Ji-min as Han Ga Yool
 * Choi Ri as Soo-jeong
 * Hwang Seok-jeong as Department Head Kang
 * Jo Kwan-woo as Moon Seong-gi
 * Oh Hye-won as Bok-ja's entourage
 * Baek Hyun-jin as Dong-soo
 * Moon Sook as Bok-Ja (Special Appearance)
 * Kim Sung-ryung as Madam Hong (Special Appearance)

Production
Principal photography began on June 6, 2017, and ended on August 27, 2017.

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:


 * Mozart Piano Sonata No.11 in A major 'Rondo Alla Turca' K.331
 * Beethoven Piano sonata No.14 in C sharp minor 'Moonlight' Op.27-2 3rd Movement
 * Chopin Piano Concerto No.1 in E minor Op.11 3rd Movement
 * Brahms Hungarian Dance No.5 in G minor
 * Tchaikovsky : Piano Concerto No. 1 in B flat minor, Op. 23

Remake
Philippine adaptation of the film was released in October 2023, Netflix.