After fifteen years of friendship turned love, Seo Yu Jun breaks up with Kang Yeon Ho, convinced his devotion is pity and believing Yeon Ho would be better off without him. The rejection shatters Yeon Ho, whose love turns into obsession as he prioritizes keeping Yu Jun close at any cost. Meanwhile, Baek Hyeon Seo, a seemingly kind senior, manipulates their pain for his own benefit, pulling the three into a tragic love triangle driven by guilt, obsession, and control.