Lin Yi, a disciple of the Jiuxuan Sect, spent eighteen years cultivating in the deep mountains. To investigate why the dragon veins and national fortune of Huaguo had been damaged, he ventures into the world for practical experience. He eventually settles in Yibin and becomes a supermarket cashier. This place gathers dragon energy, and after midnight, a door can open a space-time passage connecting to ancient times. He trades modern, inexpensive goods with people of the past and travels through time to investigate information about the dragon veins, quietly influencing history through the overwhelming advantages of a later era.