The snow is blowing in the wind, and Yanmen Pass is in danger. The 25-year-old famous general Nan Yiba held 50,000 remaining troops and faced the siege of 300,000 Huns' cavalry. The traitorous king Dun deprived him of his food and fodder and set up a deadly trap. In a desperate situation, the mysterious woman Liu Ruyan, whom he rescued from the Huns prisoner of war camp half a month ago, stepped forward and used her knowledge of the Huns' inside story and extraordinary resourcefulness to offer a plan to sow discord. The terrain of Heifengkou is dangerous, King Xian on the left is greedy for money, and King Li on the right is greedy. Liu Ruyan asked himself to lead a team to sneak in in disguise, hoping to use the gap between the two ministries to create civil strife. Nanyiba was sitting at the city gate, stabilizing the morale of the army with his lonely will, waiting for an opportunity to break the situation. This surprise attack on a snowy night is not only related to the survival of Yanmen Pass, but also a key prelude for Nanyiba to break free from the shackles, Qingjun to punish the traitors, and start the road to hegemony. Liu Ruyan's mysterious life experience and courage also laid the unknown foreshadowing for this troubled chess game.
