Keys to the Heart - Korean Movie - English Subtitled Trailer, hancinema.net/korean_movie_Keys_to_the_Heart.php. Established as the largest and most innovative care and education provider for children and young people in the UK and Ireland, the Keys Group incorporates. While the outcomeis predictable, Keys to the Heart does engage with its uniformly likeable cast, as well as Choi's seamless ability to weave.