In the early years of the Republic He Changsheng followed his grandfather around the world and learned a lot about medicine. One day, while He and Hu are tending to the shop, a woman dressed as a Miao, Ah Man, comes to the door and asks He Changsheng to pay his father's debt to his son and fulfil his promise.

Based on real-life cases of drug abuse, the film centers on the experiences of minors from diverse family backgrounds who become entangled with drugs, exposing the devastation drugs inflict on individuals, families, and society. Blending documentary-style techniques with educational cautionary elements, it dissects the processes and motivations behind youth drug initiation, exposes common tactics used by drug dealers to lure users, and integrates drug awareness and relevant legal knowledge into its narrative.