In the fifth year of the Dayuan Ti Xuan reign, the Empire's true enemy is no longer the equally decaying and weak Dangxiang and Khitan people, but the newly risen Chihu people from the north and south of Yinshan Mountain. The court officials are unaware of this, instead clinging to the idea of allying with the Chihu people to attack the Khitan and Dangxiang, to avenge past humiliations and reclaim the lost lands of a century ago. Wang Bin, the former Censor-in-Chief, opposes the alliance and is demoted to Tangzhou for his insolence. On his way through Tongbai Mountain, he is pursued by assassins sent by his political enemy, Cai Ting, the Privy Councillor. Xu Huai, a descendant of the Jing Sheng Army soldiers, unexpectedly awakens to a strange memory of a past life, and coincidentally saves Wang Bin, becoming entangled in a treacherous assassination plot...