Uchiha's self-cultivation

Traveling through Obito Uchiha, Lu Yan felt very heartbroken to see this group of pink-eyed people who knew how to fight and kill all day long.
Sharingan's fine-grained observation ability and copying and learning ability are used to refine medicine, refine weapons, and conduct research. If you do something wrong, you must use it to fight and kill.
This is a story of a traveler who died tragically in the world of wizards, traveled through various worlds to do things, and then developed advanced productivity in the ninja world.

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