NTR (Neighborhood Therapeutic Recreation), a volunteer club at Korea University's College of Physical Education. Though formed for service, rumors say it's full of weirdos... 
Unaware of this reputation, our protagonist Kim I-Ban joined. He tried to leave, disgusted by the crazy members who claimed they could make Ban Seon-Woo, the club member with sexual numbness, only get aroused by nipples. But something's off... I'm not gay, and I don't want to get mixed up in weird stuff... I really don't... Why the hell is my usually quiet dick standing up?! (Source: MrBlue, translated) 
Note: Includes one extra chapter.

1-5. Hwanhyeol (환혈) [Majjip] 
6-8. King Cobra (킹 코브라) [Cuke Soap] 
9-14. Eora, Igeo Jekkeo Anindeyo? (어라, 이거 제꺼 아닌데요?) [Ppukon Kang] 
15-19. Tattoo-juuibo (타투주의보) [Mulgorae] 
20-22. Haebaragi Kkochi Pieotseumnida (해바라기 꽃이 피었습니다) [Shida] 
23-27. Isanghan Somunui Nyeoseokdeul! (이상한 소문의 녀석들!) [Salty] 
Includes nine extra chapters.

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