Lead Jinshi tasks Maomao with solving a case involving the will of a metalworker acquainted with Lakan who died unexpectedly, willing specific items to his three sons. The will states that the eldest received the metalworking shack, the second a chest with an inaccessible central drawer, and the youngest a glass fishbowl; and with a note about "continuing to do tea parties as usual". Maomao, accompanied by Basen, takes a look at the metalworking shack and, upon inspecting the inaccessible chest, discovers solder blocking the central drawer's keyhole...