Everyone knows that there are many people on campus, which is a good place to make money. If we had set up stalls, the campus would not be empty now.

The school security office manages the campus appearance, and those who encounter bad behavior will register and be expelled.

If you want to set up a stall, you can bribe the security guard or rent a shop on campus.

But those costs are too high, they can be sold in the student dormitory, but some publicity work is needed, and some small advertisements are sent to tell them the location and items!