Demon: It's My Effort, Where's the Sweat?

There is no brilliant fighting spirit here, nor are there any variety of martial spirits. There are only monsters like butchers and humans like fish... As soon as he opened his eyes, Li Yan came to a country that was like purgatory on earth. Monsters are killing and eating people wantonly on the streets, but no one cares? The demon broke into the house in broad daylight, and soon there was the sound of chewing inside... In order to survive in this purgatory, Li Yan had to practice hard to prevent himself from becoming food for monsters. Many years later, looking at the four holy beasts that had turned black in front of him, Li Yan only hoped that his efforts had not been in vain. After all, Li Yan had been working hard to survive. Looking at the dying Four Sacred Beasts that he had beaten with one move, Li Yan couldn't help but be confused. I have worked so hard, where is your sweat? I've tried so hard, how come you're still alive?