Ye Han, the chief instructor of the "Long Yuan" special forces, was forced to retire because his identity was exposed during secret operations abroad. After three years of hibernation, he returned to the city as a delivery boy. From being given trouble by drunkards to challenging underground casinos, from outwitting financial fraud to forming a security group, in the alternation of food delivery boxes and body armor, a modern soldier king who uses the Beidou positioning system to target drug lords and uses military-grade drones to monitor business war scenes is writing urban legends in the most hard-core way.