Late at night, a woman rushes into a repair shop clutching a music box, begging the owner to fix it. He says the repair costs only thirty yuan, but if she wants to know why it chimes out her husband's bank card PIN every night at midnight, she'll have to pay extra. His name is Lu Xing, the owner of a run-down repair shop. While others fix objects, he repairs the truth. The moment he opens the music box, he discovers a secret hidden for ten years—a coded message concealed in its gears, left by his father, who vanished exactly ten years ago. A pursuit spanning a decade begins, while someone lurking in the shadows has been waiting for him for a long time.