In AD 1033, the second year of the Ming Dynasty in the Northern Song Dynasty, Song Renzong, who was about to take power, sent his confidant and the commander of the Imperial City Division, Xue Mengli, to Xixia to redeem Chen Hongsheng, the former gunpowder maker of the Northern Workshop. In exchange, the Northern Song Dynasty offered attractive terms to Xixia. The real reason is that the Imperial City Secret Service spy who infiltrated Xixia in the Northern Song Dynasty learned that the Xixia spy code-named "Golden Sword" had infiltrated the Song court. Chen Hongsheng was the only person alive who had seen the "Golden Sword". In order to capture the "Golden Sword", Song Renzong sent the Imperial City Secretary secretly to Xixia under the cover of a diplomatic mission to bring Chen Hongsheng back to China for identification.
There are dangers all the way, and the people behind the scenes carefully set up the plan. The identity and final truth of the "Golden Knife" are hidden in a lot of fog and are waiting to be solved.
Purpose: Carrying secrets, caring about family and country