Modern young man Xu Damao accidentally traveled to a courtyard house in 1953 and became a notorious projectionist at a steel rolling mill. After receiving the memory of the original owner, he was shocked to realize that the undercurrent of the environment was turbulent - the master Yi Zhonghai and the deaf old lady secretly controlled the courtyard. They not only embezzled the living expenses of co-worker He Daqing, but also hid the secret of colluding with enemy agents. At the same time, Xu Damao activated the "trading system"
