Non-Zero Sum Anime Details and Episodes Seo Hae-young, the only light of Yoon Hae-won, who has no money, no family, and no future. After Ko Tae-gyeom, his "friend," reveals his feelings for him,… Series info Watch free DetailsFormatMangaStatusHiatusScore45/100SourceWeb novelCountryKorea GenresDramaPsychological TagsMale ProtagonistRapeAnal SexTragedyTortureBondageSadismMasturbationGroup SexHandjob RecommendationsBuruhan SamYangtalKEEP A DOGNo ReasonSadistic Beauty: EpilogueFor My WeirdoTamyok