Secret Shop Rules: I Sell My Chewing Gum to Ghosts

I inherited the family midnight convenience store. Store Rule 1: After midnight, customers wearing red clothes will not be charged. Store Rule 2: If the shelves automatically replenish "black goods", they must be sold within three days. Store Rule 3: The neighbor's old man comes to buy walnut-flavored chewing gum every day, and he must not sell mint-flavored gum. It wasn't until I watched the news that I realized that the old man passed away three years ago, and that I sold the wrong gum that night... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.