The Teacher of Perishable Villains is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Wouldn’t it be possible to prevent a bad reputation if we turned children destined to become destructive villains into hunters and legendary hunters? If you don’t do anything, waiting is just a terrible reputation.