Lee Hyeon-seokActingNo biography available.Known For7.3Once Upon a Time in High School2004Fan ClubNo Nerds have favorited Lee Hyeon-seok yet — be the first.All fan clubsFrom NerdspinFilmographyActor22021Yain is BackTV2004Once Upon a Time in High SchoolFilmHyun-soo's Mother★ 7.3