Zhang Yuan, who died overworking from 9am to 9pm 6 days a week, entered the mental system he created — the strongest villain system in history. He became the strongest villain — the demon lord. Zhang Yuan could totally destroy all the humans in that world with one finger and complete his mission, but he doesn’t want to! He wants to enjoy retirement life in this system! When the slackest MC meets the most hardworking system, they go against common sense! Think outside the box! Enjoy the apex of life! Get everything he wants!