Seo Hae-young is the only light of Yoon Hae-won, who has no money, no family, and no future. After his friend Ko Tae-gyeom caught his feelings about him, Hae-won's life began to be ruined. Tae-gyeom, who demands a relationship through intimidation, Hae-young, who uses violence in an unknown attitude, and another friend, Joo Hyun-woo, join... A broken relationship between four people, now faded memories of the past. Who is the winner of the irreversible game?