My Days Running a Pawnshop in the Myriad Worlds

Infinite Flow + original worlds + no saintly protagonist Zhang Wei: the most common name, the most ordinary life, and, like all the other wage slaves, a longing for a freer existence. By chance, he gets a trade System where anything can be traded. He trades with Li Chengqian, crown prince of the Tang Dynasty. He trades with an esper from an apocalyptic world. He trades with a demonic overlord from a cultivation world. Anyone with a strong desire to make a trade will be delivered to the Host by the System.