Joo Hongbin has a harsh and twisted personality under the influence of his oppressive father and memories of his failed first love. Not only that, but those wounds have damaged his psyche so that in a state of extreme anger and agitation, sharp spikes like blades come out of his whole body. Hongbin, unable to forget his first love, Kim Taehee, while tracking her down, ends up meeting Son Sedong. Hongbin feels drawn to Sedong, who is confident and upbeat even in front of his harsh self.