Jiang Xiaolong, nearly forty years old, was the underground overlord of Jianghai known as "River-Cutting Dragon" ten years ago, single-handedly founding the Black Dragon Society. In a fierce and bloody battle, his wife A Ning blocked a fatal blade to save him, entrusting him before her death to quit the underworld and raise their eight-year-old daughter. Jiang Xiaolong made a blood oath before his late wife's spirit, going into hiding and selling vegetables at the old street market for ten years, single-handedly raising his daughter Jiang Xiaoman into a college freshman. Undercurrents are surging in the old street.