The story revolves around Lu Ping, a delivery rider. An ancestral copper coin left behind by his grandfather after his death gives him an unexpected glimpse into the world of immortality hidden under the mundane city - the subway station is the node of spiritual veins, the old city wall hides the secret realm, and his family is the "gatekeeper" who maintains the balance between the world of immortality and the secular world.
Lu Ping was forced to take over the inheritance of the gatekeepers. Under the enlightenment of the urban village grocery store owner (casual cultivator Lao Meng), he met the flower shop owner (the calico cat demon cultivator Su Nian), and jointly fought against the Liu family who tried to monopolize the trade between the two worlds, and the five-hundred-year-old monster who did not hesitate to plunder the vitality of the mortal world in order to return home. In the process, Lu Ping gradually learned trust and cooperation from a takeaway boy who evaded responsibilities and was accustomed to living alone. He finally abandoned the old idea of "closing the channel" and used the collective existence of seven billion people in the mortal world to build new rules for the coexistence of the two worlds, turning the world of immortality from a "hidden secret" into a shareable "window". He also found the meaning of his existence in the intertwining of the ordinary and the extraordinary.
