Shou Hei Kun, a prince of Chu sent as a political hostage to Qin in his youth after abandonment by his homeland, was adopted into the Mou family. There he forged deep bonds and fast friendships with Mou Bu and Mou Aki. This early displacement fundamentally shaped his complex loyalties and political path. Physically, he presents a distinguished and composed demeanor with an average height, light brown skin, long jet-black hair typically tied in a ponytail, and a short goatee. A warrior's build is evident beneath his court robes. Professionally, he ascended to become Qin's Head of Military Affairs and Chancellor of the Right, occupying a central role in both governance and military strategy. He oversaw campaigns and reforms, devising crucial strategic countermeasures that successfully defended Qin during the Coalition Invasion against overwhelming forces. His foresight in national defense included long-term planning to fortify Qin's borders against future infiltrations. Concurrently, he served as headmaster of the Strategical Academy, instructing future strategists like Mou Ten, Mou Ki, and Ka Ryo Ten in tactical theories and warfare principles. His personality reflects analytical and strategic traits: independent, rationally decisive, and focused on long-term objectives. He maintains a calm, collected leadership style, frequently seeking solitude to strategize, revealing a preference for intellectual detachment and privacy. Despite a reputation for ruthlessness, he demonstrates deep commitment to Qin's stability and the welfare of its people, showing compassion beneath his calculated exterior. Recognized as one of China's foremost strategists, rivaled only by figures like Ri Boku, his tactical innovations include the Echelon formation—executed by Mou Bu to shatter enemy lines—and the Hyourai tactic, enabling victory against superior numbers. His martial prowess is explicitly noted as equal to Mou Bu's, placing him among Qin's most formidable combatants. Later developments saw a pivotal shift in allegiance. Following Qin's invasion of Chu, he defected to his homeland, driven by the conflict between his loyalty to Qin and his Chu heritage. Proclaimed the last king of Chu, he led resistance against Qin. This arc culminated in a duel with his former friend Mou Bu, where he sustained a fatal arrow wound. His foundational contributions to Qin's military infrastructure, educational institutions, and unification campaigns were integral to the state's ascendancy, even as his eventual defection and death underscored the complexities of his identity and loyalties.