Reborn: Starting Out as a Big Shot

Can a spy have anything to do with being famous? After reading the introduction, I didn't want to read it.

The author, to be honest, it's so magical that an eight-year-old child always does things that only elite agents can do! It's a bit exaggerated to just start fighting with others without solving various problems such as physical fitness. You can't live a normal life! You have to wait until the protagonist develops! Now I start fighting with others all the time. I think this is really a waste of the great opportunity of rebirth. You can develop business and then use the experience of rebirth to find talents with business acumen. Why do you always fight with others all the time? Develop your own team first and make it bigger and stronger. Your butt determines your head. When you become a master, you will always touch things that you have never touched in the past. This is also a great benefit of rebirth.

Did you ghostwrite it later? Why is there no chapter name?