Boss in School 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

Seth Kwon was a born fighter. But due to his promise with his mother, he decides to stop fighting, even in self-defense… Everything changes when his father dies and leaves him with a single message: “stop getting your ass kicked”.