In the fourth year of Qingli, Zhao Yanchen, a history student, traveled through time and became a hostage in the palace of Prince Rong of the Northern Song Dynasty. His father didn't care, the people of Bianjing were shouting for beatings, and Xixia assassins wanted to kill him to provoke a dispute between Song and Liao. The emperor also regarded him as a disposable pawn and was even placed under house arrest in Xikuoyuan. Carrying the memory of history, he can only work step by step in the cracks of troubled times, trying his best to find a way out.