Illusion Hunter from Another World

Tired of being exploited by his job on Planet Alpha Uri, an alien finds escape by possessing the body of a human with the highest magic energy on Earth. Unfortunately, his dreams of a carefree life are dashed when he wakes up as Giryeo, a weak F-rank hunter whose magic can't be activated for some reason. Can the new Giryeo level up and learn how to survive in a world filled with dangerous gates and monsters?