bad blood is a Manga/Manhwa/Manhua in english language, manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Most humans may be unaware, but... The monsters that have appeared in folktales, legends, and myths throughout history actually existed. They even coexisted with humans, sharing the same realm. From a human perspective, they were ferocious and monstrous beings, while from their perspective, humans were pitiful inferior creatures. The reason they did not reveal themselves to the world was simple: they were under 'management' by an absolute authority! And today... With the emergence of the weakest hero in human history, that boundary has crumbled. The destruction of everything has begun. genre : manhwa , action.