In this chapter, the young narrator introduces us to his little brother, who is twelve years younger than him. The narrator is jealous of his brother's cuteness, but he also has a lonely childhood because his only family was his grandpa. He tells us that he borrowed his friend's scooter to go around looking for clues in the morning. He then tells her that he will treat her to hot pot and treats her to some chocolate. The young narrator is impressed by the young woman's professional sensitivity, and she tells him that she will treat him to a hot pot as well. He is surprised to learn that she has a master's degree, and he wonders what she is doing there. She tells him to wait until they have solved the case, and then she will take him to the hot pot. He says that she is as sharp as veteran like him, and that he cannot go over there because he has a big case to solve. She gives him some chocolate, and tells him not to laugh at her long faces. He asks if she is the woman who poisoned the cats. She says that he is not expecting anything out of the string of clues, but wait for a new discovery or a "eureka moment" . He wonders if he knows something about the old case, or if he just said it without thinking.