I made a game. When I woke up, I was in that game. When I was in confusion and embarrassment, the one who brought me into this world appeared and said: “Oh, Creator. This is a game only for you, but it is also a ‘duty’.”
Roy's life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver. ... It's really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven?? Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!
A prestigious senior mechanical engineer in the industry, Xu Yi was sent to a world dominated by magic. In a world with an almost non-existent industrial system, how can Xu Yi display his value? When magic collides with modern technology, when magic merges with machinery, that is the beginning of this story.