I’m an Ex-class Hunter 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

Eight races join hands against an unknown enemy to challenge it to one final battle… However, the eight races were unfortunately completely annihilated, except for one person, a hero of the human race, Arden. Using his memories from his previous life, Kiritani Sho was reborn into the modern world. While fighting as a hunter, he aims to reunite with his previous comrades. Sho may have lost his powers from his previous life, but he was given a chance to awaken after the death of his friend. Now, he goes on to challenge an unknown monster!