Princess Jiang Tang of Daliang was sent to Beishuo to get married, but there was a forged palace gate ban sign hidden at the bottom of the dowry box. On the day she entered the palace, she publicly complained about the loopholes in the palace rules on the grounds that "the token imprint did not match", forcing the enemy emperor Tuoba Yao to conduct a thorough investigation in court, and uncovered clues that Queen Murong Yan was having an affair with a foreign enemy. Tuoba Yao suspected that Jiang Tang was a smuggler, but when he intercepted her smuggling arms at the dock, he discovered that the imperial counselor Yuan Xi who was helping him had other plans. Jiang Tang lost the trust of the envoy Zhao Ke, but exchanged a set of machine drawings for the silence of the female general Ashina Yan. She wants to use the rules as a knife on Beishuo's chessboard to cut through the lifeblood of the entire dynasty.
