I Traveled Through Time and Called the System

This is a protagonist who is looking for the system after time travel. He firmly believes that the system is standard for time travellers. He didn't discover his system. He didn't think it was because he didn't have a system, but because he didn't find a way to turn on the system, or it wasn't time to turn on the system yet. Isn't that what is written in novels? By the way, he is a fan of novels. Therefore, in order to activate his system, he made various attempts and worked very hard. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.