Reborn as the Son of a Demon

My name is Cheng Yu, and I am an ordinary university history teacher! He is a typical dead otaku! Not good at interacting with people! I was taking a walk by chance and saw someone falling into the water. I jumped into the water to save the person out of good intentions, but unexpectedly, I was exhausted and went into shock! When he woke up again, he became the son of the Demon King. He now gained an invincible system and killed gods and annihilated clans! Dominate the universe! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.