After studying abroad for a semester in America, SinB is back in her home country of South Korea. A lot of things have changed. Her parents are getting divorced, her best friend, Yerin, is dating her school rival, and on top of everything SinB must hide her biggest secret of all: she's a werewolf.

Student council president Yuju has been crushing on class secretary Umji during the school year. It's already the last day of school and Yuju still can't find the courage to confess her feelings. To her surprise, Umji makes the first move.