I, a Passerby with Superpowers, Became the Final Villain.

Lin Xiao is a high school student. He lives in a world of superpowers and monsters, but his life is very miserable. His parents were brutally killed by superpowers in an accident. He hates those superpowers who destroy monsters under the guise of killing monsters. However, by chance, he saved a dying monster. Seeing that he could not be saved, the monster transferred all its beast powers into Lin Xiao's body. After that, Lin Xiao's body changed dramatically.