The Max Level Hero has Returned! 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

The weak prince of an insignificant country, Davey.
After becoming comatose, his soul escaped to a temple where the souls of heroes gathered.
He trained for a thousand years and has now returned as a max level hero!
“Just you guys wait, I’m gonna face you all head on!”
The refreshing story of Davey’s royal life and revenge has just begun.