To the outside world, Kyujin and Doyeol are cousins who live together. But behind closed doors, the younger Doyeol is a reckless lover that Kyujin somehow can’t disobey. Unwittingly, Kyujin triggers Doyeol’s possessive side as he finds himself entangled with Jimin, a rebellious high schooler he’s tutoring. Cousin, teacher, and student—all roles and rules are bound to be broken.