I, the Devil's Daughter, Am Invincible at the Beginning.

The world that was supposed to end ushered in a ray of light. What he lived for was no longer important to Wang Hai. What was important was that his new journey was about to begin! Even if you don't go to school, you can still get knowledge about demons, humans, beasts, demihumans, angels, undead, and even giants. Even living an ordinary life is very simple. Although there are struggles in this world, the constant fighting gives everyone the opportunity to be powerful. Cornelia, who seems to be invincible, has something she doesn't even know about... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.