Lin Zhou, a freshman in the history department, traveled to the Tang Dynasty and was bound to the university cafeteria system. He started from selling steamed buns under the awning of Xishi. With modern knowledge, system assistance and the wisdom of "treating guests gently and protecting yourself", he gradually built "Ping An Restaurant" into a reputation in Xishi. Stir-fried vegetables, soup dumplings, condiment workshop... When the drums of the Northern Expedition beat, the marching cakes he made were sent to the military camp. A butterfly from later generations flapped its wings in the fireworks world of Zhenguan.