Elf: Slime: After All, I Paid by Mistake

Marner, who was exhausted at work, was reborn into a two-dimensional magical world. He also got an excellent skill of immortality. He decided not to be a social animal anymore and lived a leisurely and lazy life. Every day consists of eating, sleeping and beating cute slimes. However, just like this, five hundred years passed unknowingly in his leisurely days. His quantitative changes led to qualitative changes, and he became the only full-level boss in the world! In order to continue his salty life, he took away his apprentice. Want to duel? Okay, go find my apprentice, I still have to sleep, eat and fight the cute king! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.