The protagonist has no system, the stand-in refers to the song, and the battle of wits includes a lot of DIY without breaking the original CP. This is a newcomer's first work. If there are any mistakes, please point them out. I'll try my best to correct it. The cover question will wait for future internships.
A substitute awakened in the fantasy world...
Is it good or bad for ordinary people to own the system?
Are there essential differences between humans and monsters?
Can the iron ball technology make a breakthrough in the fantasy world?
