Finless porpoises are one of China's most unique mammals, living in the country's mother river, the Yangtze. Fishing and pollution made them endangered, but China's 10-year fishing ban in the Yangtze, starting in 2021, has helped numbers return to historic levels. In this episode of "2026–2030: The Journey Ahead," CGTN traveled to Nanjing to track the "smiling angels."