Suzy Bae broke up with her boyfriend Kai, now her ex-boyfriend. She loved him for more than 10 years but he cheated on her. She felt too much pain from that love that she swears that she won't fall to anyone anymore. Lots of guys are head over heels in love with her but she is no longer interested. She turned them all down but they kept coming back. She's a monster who attracts and breaks hearts. A one of a kind monster. What if this monster fall in love? Is it going to be to Kim Soo Hyun, the popular over-friendly guy who bullies her secretly? Or Kim Myungsoo/L, the handsome delinquent who hates girls but attracted to her? What will happen if Kai came back, is she going to give him another chance?