Lin Guang has transmigrated into a beast-taming world, but his high talent makes it difficult for him to bind a beast. He even cannot use his system without binding one. Therefore, Lin decides to take his chance in the black market. However, he doesn't know that his first beast would be a girl from another world. “We've signed an Equal Contract; from now on, we can't harm each other.” “Young master, is it still time for me to apologize?”