Evil Monsters

Yi Ren, a young man from Blue Star, traveled to a different world in an accident in order to save his sleeping sister. Because of his strong obsession, he attracted a greedy demon and made a deal with him - after completing the deal, the demon would save his sister. At first, Yi Ren just wanted to complete the deal quickly, save his sister, and leave this other world. He did not want to have any interaction with the people in this world. After all, he might become the culprit of the destruction of this world. However, the moment he opened his eyes, he was blinded and deceived...