In the underground racing world, a rising racer "Xiao Le" (played by Shou Zi) gave up on himself because of an accident during a race with his brother "A Jie" (played by Alan Kuo). Until he met a female doctor "Hui Hui" (played by Ella Chan), he changed his mind and became an ambulance driver, vowing to "save people with speed". However, fate did not let Xiao Le go easily. Under the joint investigation of San Bao (played by Da Yuan, Lin Zhenyi, and Lin Zhiqian) and the big brother of the underground racing world "Ben Ge" (played by Xiaochun), the truth about A Jie's accident gradually emerged...