Running Man’s resident Flower Boy threw in the towel (or should I say name tag) during episode 41 in order to focus on his acting career. His schedule, consisting of his acting and his appearance on Running Man, became too much for him (and led to a very teary promise to return a better person). Despite the sorrow of seeing SJK leave his decision seems to have worked out well- JK has had hit movies (Wolf Boy) and hit television shows (Nice Guy) since his departure from RM.