A preschool class organizes a hot pot potluck. Li Xinran's son, Chenchen, 'randomly' draws four king crabs. Remembering several previous activities when her son claimed he hadn't eaten the expensive food she had brought, she decides to investigate. Li Xinran initially keeps quiet and buys the crabs as usual, delivering them to the school before joining other parents to arrive just as the meal begins. But through the classroom window, she sees that the children have only crab sticks, starchy meatballs, and vermicelli in their bowls. Where did the four king crabs, along with the premium ingredients brought by the other parents, actually go?