I've Been Secretly Eating Monsters from the Demon Mansion for Ten Years, and I've Bullied Everything

Ye Feng was reborn in the ancient country of China, only to find that demons were rampant in this world, cultivators disappeared, and everyone was in dire straits. In order to survive, Ye Feng entered the Demon Removal Mansion and became an officially employed demon remover. However, he did not expect that this was a short-lived job, and if he stayed for one more day, he would lose a year of his life. But after signing the contract for fifteen years, I can't escape, what should I do? Ding, get the unlimited upgrade system. As long as you keep practicing, you can upgrade without limit! Upgrade the Whale Swallowing Technique first! Upgrade the Whale Swallowing Technique to +999 and achieve the ultimate gluttonous body! Swallow a monster on sight, swallow a beautiful yellow-level snake monster, and gain +10,000 experience Star Absorbing Technique +999, Achieving the Supreme Black Hole Star! All the spiritual energy, demonic energy, and vitality within a hundred miles around him were sucked away in one breath! Kill 1,000 Xuan-level monsters and gain +1,000,000 experience Since then, in this world of demons, a real god of death has appeared. All the evil spirits think that Ye Shashen is a thousand-year-old demon. In fact, Ye Feng is a human! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.