The Most Dimensional Store

Is it difficult to level up? There are endless elixirs available in my store. Is it difficult to upgrade your martial arts level? Just spend money in my store and you can instantly practice martial arts to perfection. Do you have an artifact? Sorry, I have an artifact from the world. I also have the mysterious Mr. Cang for sale in my store, do you want it? The protagonist travels to another world with a super portable store, where he can buy everything he can't imagine. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.