There is a shop that sells only time-related products. Xiaoya was lucky enough to find it, and she preordered a product that would give her extra time on an exam from the shop's manager, a kind, gentle old woman with a head of silver hair.
The time product really worked, and she finished the exam just as she'd hoped.
But three days later, one of her answers had vanished from her test paper. When she went back to look for the time shop, she couldn't find it anywhere.
Theme: The meaning of time
