Nobody Knows1 Seasons-16 Episodes 7.9 / 10 19A high school boy falls off of the top of a building and lapses into a coma. A detective and his school teacher attempt to get to the bottom of the incident.DramaCrimeMysteryDirected by Lee Jung-heumWriters Stars Kim Seo-hyung Ryu Deok-hwan Park HoonWATCH TRAILER