Shiro felt annoyed by the shopkeeper's ignorant behavior. The shopkeeper must have thought that no one would find out about his deeds.
While listening to the shopkeeper talk, Shiro remembered about his mission that was given by the system yesterday.
It required him to play as the bad guy, and Shiro thought that this was a good opportunity.
Before doing anything, Shiro walked away from the shop and asked the system what he should do first. He didn't want to make a mistake like last time.
*Ding*
[The system advises the host to cheat from every shop.]
At first, Shiro did not understand what the system was implying.
Clearly, this seemed to be the best shop to act as the bad guy. Why bother cheating other innocent shopkeepers off their products?
However, after thinking for a minute or two, he realized that the system's plan was a solid one.