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This video follows the journey of Yi Seo-jun, the emperor's overlooked illegitimate son who possesses the tactical genius of the legendary deceased commander Kang Mu-yeol. After surviving past betrayals, Seo-jun now maneuvers through dangerous palace politics, protecting his sister, Princess Nari, from suspicious medical treatments and building a network of allies including his loyal servant Sora, a sharp record-keeper named Min Jay-hua, and a skeptical former general, Jong Thai-rim.
To solidify his standing, Seo-jun focuses on uncovering corruption within the imperial administration, specifically targeting the logistics of the Broken Moon campaign and the misdeeds of Minister Beck. He uses bureaucratic processes as weapons, successfully securing resources like lamp oil and clearing Jay-hua of false charges by turning the palace's own rules against his enemies.
The central conflict reaches a head during the Autumn Field Exercise, where Seo-jun is forced to lead the Black Unit—a group of social outcasts, injured cadets, and misfits. Despite being set up to fail by the Crown Prince Do-gyeom and his elite White Tiger Unit, Seo-jun refuses to engage in a conventional, disadvantageous battle. Instead, he treats the exercise as a real-world military simulation, focusing on logistics, terrain advantages, and wearing down the opposition's resources rather than chasing glory.
Through a combination of unconventional tactics and strict discipline, Seo-jun forces his opponents into errors. The climax of the exercise involves a high-stakes commander challenge where Seo-jun successfully navigates his physical limitations and uses his team to bait the Crown Prince into crossing the boundary, resulting in a shocking tactical victory. By the end of the exercise, Seo-jun has not only survived the setup meant to humiliate him but has proven that his strategic mind is a force to be reckoned with, earning the grudging respect of observers and turning the Black Unit into a capable, loyal force.