Yaoi manga about Yakuza, both the uke and seme has tattoo of a snake, one has white snake the other black snake. I think the one with the white snake left the Yakuza, though back in the day they were the best combo
trap city?
This? http://www.mangago.me/read-manga/trap_city/
No, it was a manga not webtoon.
Yaoi manga about Yakuza, both the uke and seme has tattoo of a snake, one has white snake the other black snake. I think the one with the white snake left the Yakuza, though back in the day they were the best combo