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If you don't know, does it mean it doesn't exist? Inexplicable things, how do you know? Not "them"

Ye Tian traveled through time and became a poor man whose parents died, leaving only a dilapidated machinery factory. He was desperate and committed suicide. Fortunately, he was bound to a top-level engineering system. Simply put, this system can superimpose Ye Tian's hands-on ability to create various items. As long as he has enough system points, he can build even the most sophisticated mecha with his hands. But the cost of making models required a lot of money, and food and clothing were about to become a problem, so he embarked on the road to making money through handmade live broadcasts...