I honestly thought I posted this before but I guess not. I first read this on MangaRock before it went down before I knew of Mangadex. This may contain spoilers, pretty sure it is a spoiler. Apparently in a temple are boys* gathered together in a temple or some type of shine and their hair can be make into paint pigments. The colours are red, blue and yellow iirc are the main. The longer your hair is the more vibrant it will be. MC: _Was kept hidden _Hair colours neither of those, his hair colour is black ML: _I don't remember his hair colour but I recall the manga being light so I think it was red or yellow. _Taunted MC So MC kissed ML and ML started to freak out because his hair got tainted. It was turning to black. Apparently, there is a reason why they are gathered and forbidden to interact outside if you get into a relationship you lose your colour. *Boys - it's revealed that they are genderless I believe but they look like boys and a SA tag there. I'll update as I remember.