The Northern Territory of the Chu Dynasty was in danger, and the concubine Su Mu relied on the ancestral black iron abacus (which could deduce the battle situation and predict people's hearts) to counterattack from the desperate situation of being exiled by her eldest sister. She disguised herself as a man and joined the army. In the name of "Su Jiulang", she repeatedly broke through strange formations - raiding enemy camps at night to intercept secret messages, riding alone through barriers to transport grain and grass, and conducting sand table deductions to locate border towns. She was gradually promoted from the Huotou Army to the general. From testing each other to fighting side by side with Pei Yan, the cold-faced general of Zhenbei, in the "suspicious clouds between monarchs and ministers", "rebellion between enemies and countries" and "revenge of old grudges", the two transcended their identities and positions, and finally became life and death partners who "hold the sword to protect the mountains and rivers, and hold the hand to grow old together". The cool points focus on: counter-killing in house fights, crushing with clever tactics on the battlefield, generals disarming themselves and confessing, and making generals in the northern border.
