![Rellik](https://image.tmdb.org/t/p/w185/tk2wxIAgd7RBusNiaDSrfs3sAB9.jpg)
The Plough (Big Dipper) Department is a special investigation institution that works for the emperor of the Northern Song Dynasty. Tai Sui and his partners work together to break odd cases and punish the evils. Through a series of cases, Tai Sui found out there was a hidden conspiracy behind these cases, and it was related to his unknown past.