I'm Actually the Protagonist

"Your surname is Xiao, an illegitimate son, and your mother sacrifices to the sky?" "You kill people with your left hand and save people with your right hand?" "You failed to overcome the tribulation and were reborn as a senior in high school?" "After your experience, you want to inherit 300 billion?" "How many billions of years has your mother lived?" "You have destroyed the sky and come to earth to show off?" "Wait a little later, little brother, let me tell you a secret, this world is a novel, you are a sidekick..." "And I am the protagonist!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.