Non-zero sum

Seo Haeyoung was the only light in the life of Yoon Haewon, a man with no money, no family, and no future. After his feelings for Haeyoung were discovered by his friend, Ko Taegyeom, Haewon's life began to fall apart. Taegyeom, who demands a relationship through blackmail; Haeyoung, who wields violence with an inscrutable attitude; and the addition of another friend, Joo Hyunwoo... The broken relationships of four people, And memories of a past that have now faded. Who will be the winner of this irreversible game?