If I Don’t Die Soon, I Will Rule The Demon Realm 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 legendary human warrior, vanquished in a brutal confrontation with the demonic forces, is granted a second chance at life. Paradoxically, he awakens as a member of the very race he had sworn to destroy. To reclaim his humanity, he must embrace the irony of his existence and seek a fatal end. However, as he dances with death, he uncovers a sinister plot that threatens both worlds…