Lee Geum Bi was a normal teenager or so she thought she was until her parents died leaving her and her little sister with her aunt. Her parent's death was a scar on her being that she witness their hearts being ripped out. Geum Bi vowed to avenge her parents death since. Her aunt eventually told her what she was and transferred her to Pledis Academy. Little did she know, her aunt was hiding her identity from her. There, she meets 13 boys who she never expected to play such important roles in

Mingyu and Aeruem have been best friends since they were 10. They went to the same elementary, middle school and high school. But when they enter their sophmore year, everything started to go downhill. Aeruem liked Mingyu since they were little but never told him, now that Mingyu has a 2-faced girlfriend, they started to drift apart.