Directed by Choi Seong-hyeon (최성현)
Screenplay by Choi Seong-hyeon (최성현)120min | Release date in South Korea : 2018/01/17
Started filming : 2017/06/06
Wrapped up filming : 2017/08/27
Also known as "That's Only my World"
"Keys to the Heart" is the story of a boxer and his brother, who is a brilliant pianist with mental disabilities, reconciling through their mother.
DVD 2-disc (Normal Edition) (En Sub)
DVD 2-disc (En Sub)
DVD (TW - English Subtitled)
DVD HK (En Sub)
Music Video Full
Unpublished Special Video
Lee Byung-hun and Park Jung-min Interview
English Subtitled Trailer
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