Chen Yu, an avid fishing enthusiast, catches a highly venomous dark-spotted pufferfish in a river bend and plans to keep it as an ornamental fish. He briefly leaves it on his electric scooter while shopping at a supermarket, only for a villager, Liu Jingui, to steal it. When Chen Yu discovers the fish is missing, he immediately warns the village over the loudspeaker, calls the police, and repeatedly visits Liu Jingui to plead with her, explaining that the pufferfish is extremely poisonous and must never be eaten. Liu Jingui refuses to admit what she has done and cooks the fish into soup, leaving her five-year-old grandson, Xiaobao, critically ill with poisoning. To save the child, kindhearted Chen Yu pays 170,000 yuan in medical expenses upfront, only to be extorted by Liu Jingui's family, who keep demanding exorbitant compensation.