Non-Zero Sum

Yoon Haewon, who has no money, no family, and no future, finds his only light in Seo Haeyoung. However, after his feelings are discovered by his friend, Go Taekyum, Haewon's life starts to collapse.

Taekyum begins to blackmail Haewon into a relationship, all the while, Haeyoung unknowingly why, turns violent. Adding to the confusion their friend Joo Hyunwoo joins the fray...

Their relationship starts to crumble, memories of the past become faded as this twisted irreversible game is set in motion. Who will come out on top?