Haewon commits suicide but survives, but the three men believe he is dead. This triggers severe guilt and mental breakdowns across the boardTaegyeom and Hyunwoo spiral into immense guilt and constant nightmares.Hae-young completely loses his mind, resorting to self-harm and experiencing vivid hallucinations of Haewon.Eventually, Hae-young discovers that Haewon is still alive. By this point, Haewon’s mental state is entirely fractured, and he suffers from severe trauma bonding.Instead of seeking revenge or escaping, Haewon chooses to forgive Hae-young. The other two friends are cut out of his life, but Haewon ultimately returns to Hae-young. They remain locked together in a highly codependent, broken relationship—perfectly embodying the title "Non-Zero Sum," where both sides completely destroy each other and lose together.

I just read the novel spoilers and wtf kinda ending is that