Xiao Jin was demoted to the north as a slave, but secretly refined his troops and weaved webs; Su Yuan hid in the army with the late emperor's edict, watching the world collapse with cold eyes. Lu Zhaoyang borrowed a knife to kill people, Shen Zhiqiu used a pen as a blade, Bai Wuxia killed his master and turned against the enemy, and Zhao Tiegu used his broken body to forge a crossbow to destroy the country. When the Northern Cavalry crushed the palace gate of the imperial city, they realized that the tragedy of annihilation actually involved the forbidden blood curse of three generations of the royal family.
Xiao Jin used enslavement in the north to gather refugees and secretly build the 'Dragon-Breaking Crossbow'. Su Yuan, as a military doctor, secretly restored the late emperor's edict and revealed the secret technique of royal blood sacrifice - each generation of monarchs extended their lives with the blood of their closest relatives, and Xiao Jin's family was the chosen sacrifice. Lu Zhaoyang wanted to use Xiao Jin's hand to overthrow the imperial power and establish himself, but he didn't know that he had already laid a series of tricks. When Shen Zhiqiu forged the files, he discovered that the imperial edict that framed Xiao Jin had the ink of Su Yuan's grandfather. The truth is suffocating. Bai Wuxia was ordered to assassinate Xiao Jin, but he disobeyed the order for the first time after witnessing him breaking his arm to save the slave boy. The last crossbow forged by Zhao Tiegu penetrated not the city wall, but the secret passage of the underground palace of the imperial mausoleum. When Xiao Jin led his army to massacre the Ancestral Temple, Su Yuan announced the imperial edict to the world, revealing that Bai Wuxia was the true bloodline of the emperor, and that the emperor was just a puppet. The imperial city collapsed, but Xiao Jin discovered in the ruins: there was a third instigator of that massacre. Outside the northern border, there are changes in the border, and the chaos in Mobei is rising again - and Su Yuan's people are the descendants of the barbarian royal court who were wiped out back then.
