HomePeople Biography and filmographyChoi Sung-hyun Biography unavailable on TMDB. Movies (4)TV shows (1) Photos Movies (4) La clave del corazón2023 · Writer The Negotiation2018 · Writer Keys to the Heart2018 · Director, Writer The Fatal Encounter2014 · Writer TV shows (1) Geumgyul 1 : Mean Girls on the Green2026 · Director, Writer