In a time of political turmoil and secret executions, the Qing Dynasty creates a covert assassination squad known as the Guillotines. Tasked with eliminating threats to the emperor, these skilled fighters wield deadly, disc-like weapons capable of beheading enemies with precision. Led by their dedicated commander Leng, the squad's unity and loyalty are challenged when one of their own, Mu, is assigned to capture a runaway rebel leader named Wolf. As Mu delves deeper into the mission, he begins to question the morality of his orders and the true intentions of those in power.

Tensions rise as Mu's growing doubts lead him into a confrontation with bases and beliefs long held by the squad. Meanwhile, internal discord escalates among the Guillotines, creating fissures in their once unbreakable bond. As the group grapples with trust issues and disillusionment, they realize they must confront not just their enemies but also their own sense of honor and duty. The story evolves into a compelling exploration of loyalty, redemption, and the human cost of unwavering allegiance to a flawed empire.