A fifteen-year friendship that turns into love begins to crumble when Seo Yu Jun starts believing that Kang Yeon Ho’s devotion is not love, but pity. Seeing Yeon Ho’s seemingly perfect life, Yu Jun comes to think of himself as a flaw in it and decides that Yeon Ho would shine more without him. Proud and resolute, he chooses to break up, even if it means becoming the villain in Yeon Ho’s life.

Yeon Ho, raised without fear or want, becomes powerless only in front of Yu Jun. When the love he gave with his whole being is rejected, his everyday life collapses. His love twists into an obsessive desire, where keeping Yu Jun by his side matters more than Yu Jun’s happiness or pain.

Into this fracture steps Baek Hyeon Seo, a senior who appears gentle but exploits their suffering. He pushes Yu Jun to use him as a way to end the relationship, quietly taking advantage of Yeon Ho’s absence. Their intertwined emotions spiral into a tragic romance driven by guilt, obsession, and manipulation.