Non-Zero Sum

Description

Warning: The series is under the tag "비욘드 하드코어", which means beyond hardcore, meaning it contains potentially triggering themes, including coercive relationships, sexual assault by multiple partners, gaslighting, and stockholm syndrome.

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, Hae-won's life begins to fall apart.

Tae-gyeom demands a relationship through threats, Hae-young wields violence in an unknown manner, and another friend Joo Hyun-woo joins the ranks...

The broken relationship between the four people, the memories of the past that are now faded.

Who will win the irreversible game?

Original Novel:
Volumes: RIDI, MrBlue, Bookcube, Naver Series
Chapters: Bomtoon, Bookcube, Joara, Naver Series

Original Webtoon:
Bomtoon, Lezhin, RIDI

Official Translations:
Japanese: Beltoon, Lezhin, cmoa
Others: T.Chinese, Thai

Type

Manhwa

Related Series

N/A

Associated Names

Non Zero-Sum

ノン・ゼロサム

非零和博弈

非零和賽局

논 제로섬

논제로섬

Groups Scanlating

Cupid Scans

Latest Release(s)

c.18 by Cupid Scans 6 months ago

c.63 by Cupid Scans 6 months ago

c.62 by Cupid Scans 6 months ago

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Status in Country of Origin

71 Chapters (Ongoing)

S1: 36 Chapters + Review (1~36)
S2: 35 Chapters (37~)

Completely Scanlated?

Anime Start/End Chapter

N/A

User Reviews

N/A

Forum

0 topics, 0 posts

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User Rating

Average: 5.9 / 10.0 (25 votes)

Bayesian Average: 6.09 / 10.0

16%

12%

24%

Last Updated

November 15th, 2025 6:31am PST - 4 days ago

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Genre

Adult Drama Mature Psychological Smut Tragedy Yaoi
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Categories

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Category Recommendations

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Revenge (Lee Geum-San)

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Recommendations

N/A

Author(s)

Artist(s)

Year

Original Publisher

Serialized In (magazine)

Bomtoon (Deep Plum)

Lezhin (Deep Plum)

Licensed (in English)

English Publisher

N/A

Activity Stats (vs. other series)

Weekly Pos #357

(-92)

Monthly Pos #694

(+163)

3 Month Pos #382

(+170)

6 Month Pos #240

(-68)

Year Pos #249

(+58)

List Stats

On 120 reading lists

On 120 wish lists

On 6 completed lists

On 4 unfinished lists

On 82 custom lists

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User Comments [ Order by usefulness ]

good psychological tragedy AND horror

by spinalcord
5 days ago

Rating: 8.0 / 10.0

if you are triggered by the following warnings: rape, manipulation, gaslighting, mental and physical abuse, torture, beatings, threesomes, dub-con, blackmail, then you already know this story isn't for you.

this is a very, good psychological yaoi. the protagonist's suffering, mental angst and how he shows his trauma is so well done and not superficial like other yaois. he suffers and you see it clearly--the author did do research about PTSD and about traumatic responses. the bugs, the filth, the trauma of certain sounds, the paranoia, the anxiety... the claustrophobic atmosphere and the feeling of despair was well done. this really deserves the horror tag because it doesn't have to have monsters to be horrific--the three men that were supposedly his friends commit all the monstrosities and torture to him. humans of flesh and blood. the three "main interests" are well-defined and have their own archetypes: the bully/arrogant, the golden retriever and the main leader, the "cool and handsome guy." although the plot and scenes can be repetitive at times, imho, it serves as a slow process of the protagonist accepting that there's no help coming for him. no savior, no magical occurrence for the hero of his story come and save him--he is all alone, and will fight alone.

also, i can see how some people are disappointed or annoyed, but the protagonist's reactions and actions are valid. someone who only know those three friends for them to turn against him is a shock, specially when he has no one. if you expect a dark yaoi that breaks from the stereotype, then look somewhere else.

note: being honest, this one doesn't deserve the 1 rating by the people who think that just because this manhwa has dark themes, disturbing and hard-to-swallow plot/scenes, it deserves a low rating. being disgusted doesn't equal to a bad writing.

... Last updated 5 days ago

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Not really proud of liking it but here we goes.

by Macabreriz
4 months ago

Rating: N/A

This manhwa finally gave prooft to me on how peoples trauma affects on their enjoyment of reading fk up contents, including me. I ask few other and they would always answer with this manga is too much. I do not talk for the perspective of all folks that have Chronic post traumatic disorder, but i am one. This manga articulate well of tragic mental manipulation on the most extreme form and to think this does happen in real life, fked me up. Sometime i read some of the chapter and start holding my breath, i took a walk to process thing. This felt real this manhwa felt REAL. It doesn't cover traumatic reaction in a flower baskets, it cover it in Thorn. Throwing you into pack of hyenas and spat on you. Peoples with CPTS exist and some even behave as such, especially when being put on the abuser, fight or flight situation. All the goddamn time.

The protagonist behavior and his abuser, exegratingly make sense to me and its painful read. But i never get close to any other media that treat ptsd as real as this. Other than on war film. Do you know CPTSD can happen by simply having a shitty childhoods?

Despite all the negative connotation i write here, i actually enjoy reading this. Slowly healing from CPTSD had make me experience stoning.. in which i can't felt much emotions, but this Manhwa make me relive it again. That exist.

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The Most Painful Thing I've Ever Read

by quicksilverreads
6 months ago

Rating: 7.0 / 10.0

I love angst, but there comes a point when it's just too much for me. This is that point for me. For me, there has to be some sort of relief from the angst. A soft place for the reader and the protagonist to take a breath. Maybe I didn't read far enough to see the relief, but I couldn't take the pain anymore.

When all three semes were revealed to be rapist pieces of crap, I lost interest. And the 'nice' one even has the audacity to look down on the other two, even though he admits to himself that he raped the MC and didn't care.

I might pick it back up sometime later and try again, but for now, I'm going back to my grayer angst.

... Last updated 6 months ago

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Horrible !

by Lili_1082
7 months ago

Rating: 1.0 / 10.0

I stop at chapter 15, I see no interest in this webtoon other than the illustrations. The scenario is a succession of physical and sexual abuse. It's just disgusting and pointless.

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I love it

by dia69
2 years ago

Rating: 10.0 / 10.0

I love it Psychological thriller with Stockholm Syndrome. Just the genre's tragedy leaves a bitter taste in my mouth. The first 14 chapters are really good and the beautiful art design supports the darkly tragic atmosphere.

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