Shou Hei Kun, known also as Lord Changping, belonged to Chu's royal family before being sent to Qin as a political hostage in his youth. Abandoned by Chu, he was adopted into the Mou family, forging deep bonds with Mou Bu and Mou Aki as sworn siblings. He integrated into Qin's military and political spheres, initially studying strategy under the renowned general Ko Shou. His abilities elevated him to become one of the Four Pillars within Ryo Fui's faction, though he remained independent of Ryo Fui's extremes and ultimately aligned with King Ei Sei. A tall, handsome man, Shou Hei Kun possesses long brown hair typically secured in a high ponytail and a short goatee. His sharp brown eyes often hold a pensive look. In court, he wears elaborate, oversized robes; on campaign, he dons dark armor featuring snake motifs. His demeanor remains consistently calm and stoic, with stress occasionally revealed by facial stubble. His warrior's physique hints at significant martial skill beneath the courtly attire. As Qin's Chancellor of the Right and Head of Military Affairs, Shou Hei Kun wields supreme authority over military operations and strategy. He personally instructs future tacticians, including Mou Ten, Mou Ki, and Ka Ryo Ten, at the Strategist Academy he oversees. Recognized as possessing one of China's finest strategic minds, rivaling figures like Ri Boku, he demonstrates a sharp eye for talent, notably attempting to recruit the young warrior Shin multiple times. He commands the Shou Hei Kun Army, featuring elite units like the royal-protecting Black Cavalry Corps, with key retainers including strategist Kai Oku and swordsman Hyou Shiga. Shou Hei Kun shaped pivotal Qin campaigns. He overruled Mou Bu to appoint Ou Ki as commander-in-chief at Bayou, a decision that haunted him after Ou Ki's death. During the Coalition Invasion, his strategy consolidated forces at Kankoku Pass, calculating Qin's survival odds at "one in five." Its success culminated in a rare display of emotion: a smile and handshake with Chancellor Shou Bun Kun following Mou Bu's victory over Kan Mei. He later supported Ei Sei's defense of Sai by dispatching experienced commanders. Ultimately, his Chu heritage drove his defection. Historical accounts place him relocating to Chu's capital, Ying, around 226 BC. When Qin invaded Chu under Li Xin and Meng Tian, he allied with Chu general Xiang Yan, repelling the assault and inflicting heavy losses. After Qin captured King Fuchu, Shou Hei Kun was proclaimed Chu's new king, leading resistance and rallying conquered cities against Qin. He was killed in 223 BC during the final Qin campaign led by Wang Jian and Meng Wu; the narrative suggests his adoptive brother Mou Bu delivered the fatal blow. Shou Hei Kun's martial prowess was formidable, claimed to match or surpass Mou Bu in his prime. During the State of Ai rebellion, despite retirement from frontline combat, he led a cavalry charge and personally dueled the strength-focused Duke of Juuteki, efficiently disabling him by severing his weapon arm before a finishing strike. Speculative analyses based on in-universe stats credit him with near-peak leadership, intelligence, and strength, ranking him among Qin's most powerful figures. His combat style emphasized precision and exploiting weaknesses over brute force.