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

Kim Min-soo, a hero who saved another world with the single thought of returning home. He saved the world, but couldn’t save himself, and decides to destroy the world. This story is about the last moments of the heroes, a cold reality with no happy ending.