Library

I want: "Learn complete textbook teaching knowledge" "Learn Missile Making" "Learn how to operate a mecha" Completed learning and successfully mastered the skills learned ------Knowledge eventually becomes power

This is a relatively pure martial arts novel. There is no systematic blessing, no magic weapon or golden finger. It is just the protagonist's small wish. He does not have much pursuit, and it may be for one person, and that's it. But whoever blocks him, he will lift the knife in his hand. He is an assassin.