Lin Chen, a 28-year-old delivery boy, supported his family of five after graduating from high school and delivered food for three years, but was diagnosed with terminal liver cancer. In a desperate situation, the "human life extension system" is activated. When meals were stolen, he identified repeat offenders; when faced with malicious complaints, he defended his rights; when he saw people in trouble, he stepped forward. Starting from the rainy night in Jiangcheng, he exchanged his good deeds for life, skills and money, extending his life in the fireworks world, and also guarding his family, love and dignity on the edge of the city.
