Shou Hei Kun, originally a prince of Chu known as So Shi in his youth, was sent to Qin as a political hostage. Abandoned by Chu, he was adopted into the Mou family, forming close bonds with Mou Bu and Mou Aki as adoptive siblings. He honed his expertise in military strategy under Ko Shou, one of Qin's original Six Great Generals. Initially aligning with Chancellor Ryo Fui, Shou Hei Kun became one of the "Four Pillars" of Ryo Fui's faction. He rose to Chancellor of the Right and Chief of Military Affairs, overseeing Qin's military strategies. He established a strategist academy to train future talents like Mou Ten, Mou Ki, and Ka Ryo Ten. His loyalty shifted during the Ai rebellion, when he defected from Ryo Fui to support King Ei Sei, personally leading troops to crush the rebellion and secure Kanyou. In military operations, Shou Hei Kun demonstrated exceptional strategic acumen. He devised Qin's defensive strategy during the Coalition Invasion, abandoning outer territories to concentrate forces at Kankoku Pass. This plan, initially assessed as giving Qin only a "one in five" survival chance, succeeded due to key victories like Mou Bu's defeat of Kan Mei – a moment where Shou Hei Kun's earlier confidence in Mou Bu proved decisive. He orchestrated the annexation of Sanyou, renaming it "Tougun" and overseeing its settlement with Qin citizens. His tactical prowess was evident in the Ai rebellion, where he employed the "Hyourai" formation to overcome severe numerical disadvantages with minimal forces. During the Western Zhao invasion, he recognized the near-impenetrable fortifications engineered by Ri Boku, leading to the high-risk assault on Gyou. Physically, Shou Hei Kun possesses long brown hair tied in a high ponytail, a short goatee, and sharp eyes. He wears ornate robes in court and dark, snake-motif armor on the battlefield. His personality is calm, methodical, and emotionally stoic, maintaining unwavering focus on his duties regardless of political shifts. Key relationships include his deep bond with Mou Bu, whom he considers an equal in combat and a lifelong friend. He mentored his adoptive nephews Mou Ten and Mou Ki, alongside Ka Ryo Ten, at his strategist academy. He early recognized the potential in the low-born warrior Shin, seeking to recruit him multiple times despite Shin's initial refusals. Historical trajectories indicate his future defection back to Chu around 223 BCE, leading military campaigns against Qin, setting the stage for a climactic confrontation with his former ally Mou Bu.