Alien: Exchange for Special Forces at the Beginning.

Tianyu, who grew up in modern society, obtained the system to travel through various worlds, and built modern buildings and high-tech civilization products into different worlds... Various magical items can be exchanged from the system for modern food, science fiction products, mythical beasts, fairy beasts and other different things to be sold to various worlds to earn points, and various incredible items can be exchanged from the system, such as cat women or divine goddesses... System motto: Only if you can't think of it, no system can do it. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.