Ji Minli, Zhao Chen, Wang Lele and Li Xueer were originally partners in a modern laboratory. An experimental accident caused them to travel to Bianjing in the tenth century AD. In this strange era, the medical clinic has become their foothold. The four of them supported each other in difficult situations, treating illnesses and saving lives while exploring the truth. Can they solve the mystery of the "Book of Heaven", stop the conspiracy, and find a way home?
