The Reborn Me Started the Industrial Revolution in the Ninja World with My Own Hands

When I wake up and travel to the world of Naruto, why do people in this world have names on their heads, and their names also have colors. Level 1 villager, level 1 doctor, level 2 hunter, level 5 warrior, and level 8 ninja. White is unfamiliar, green is friendly, and red is hostile. But now that you have come, let's leave something behind, so as not to embarrass the group of time travellers. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.