His daughter is short €127 on her medical bills. Xu Chuan grabs a wrench and storms off to repair the boiler. If he can't fix the heating for the entire town, he doesn't deserve to call himself a father! Foreign experts sneer, asking how a cleaner could possibly handle nuclear-grade equipment. He stakes his life on it: while they rely on instruments, he listens to the sounds. From smashing through the town's heating crisis to exposing a foreign executive's €8 million extortion scheme and catching an Odin mole with his bare hands, Xu Chuan proves his extraordinary abilities. Dismissed as the son of a nobody by a research institute, he casually lays down his cards: "I wrote the questions, and I was the one who gave away the money. Elder Li, does this position come with five types of insurance and a housing fund?" He brings the Tianshu to life by listening to the breathing of a capillary tube, and locates a giant sea dragon thousands of meters underwater by following the crackling of ice crystals. In the final showdown, father and daughter work together: one wields the knife, the other listens to the sounds. They build a vehicle with dovetail joints, and the sea dragon finally plunges into the ocean! The entire internet falls to its knees, shouting, "Father, please accept our kneeling tribute!"