Take the crown, I want to be a king 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.cc fastest updating comic site. The Summary is

A young boy with a terminal illness was caught up in an incident and obtained a system , that could cure him, but in exchange, he has to defeat the nine people with great superpowers. He accepts the task, and later found that the system has provided him with a skill [Domination] , which makes all his defeated enemies to listen to his commands no matter what !