I'm a Summoned Beast

He was a physical training martial artist who had just awakened his soul, but after falling asleep, he was summoned to a different world of modern civilization. There are demon towers, demon caves, and beast realms here, but the familiar aura is missing from the air. Human beings are also very rare and pitiful. Compared with aliens, human beings are endangered. Living things are generally divided into rough levels of strength here, and there are also cheating methods to improve strength. As a person from another world, there is no way to improve by yourself. The only thing that makes him feel lucky is that the improvement of strength will also increase his lifespan, otherwise he will probably choose to commit suicide.