Shin, orphaned by an unknown conflict at age five, survived as a servant in Qin's Jouto Village. There, he forged an unbreakable bond with fellow orphan Hyou. Both dreamed of escaping servitude by rising through Qin's military ranks to become the "Greatest Generals under the Heavens." They relentlessly trained with wooden swords, enduring over 1,250 sparring matches throughout childhood – Shin won 333, lost 334, and drew 587. This forged his core determination and combat skill. Hyou was taken to the royal palace as a body double for King Ei Sei. He returned mortally wounded after a political coup. With his dying breath, Hyou tasked Shin with aiding the king, who resembled him. Shin protected Ei Sei during the subsequent rebellion, facing assassins like Jo Kan and Muta. Witnessing Hyou's sacrifice crystallized Shin's resolve to achieve their shared dream. This path led him to encounter the strategist Ka Ryo Ten, whom he later adopted as a sister, and enlist in the Qin army. Starting as a foot soldier, Shin faced skepticism due to his youth and peasant origins. His leadership ignited during the Keiyou Campaign, rallying survivors against Wei war chariots. This earned him recognition and promotion to 100-man commander. General Ou Ki later named his unit the "Hi Shin Unit" (Fast and Trustworthy Force) after the Battle of Bayou, where Shin assassinated Zhao General Fuu Ki. Shin's appearance transformed from a lean 14-year-old with spiky black/brown hair and a rat-tail ponytail to a muscular warrior. He consistently wears a sleeveless blue Yue-style shirt, black wristbands, and white pants. After promotion to 1000-man commander, he adopted sky-blue scale mail armor with bracers inscribed with Kyou Kai's clan markings and leather boots. A spiked neck guard was later added to his right pauldron, honoring Duke Hyou. He wields Ou Ki's glaive as his primary weapon and carries Hyou's sword as a secondary armament. His personality blends fierce loyalty, hotheadedness, and unshakeable determination. Intense rage consumes him when comrades are harmed, driving him to challenge powerful foes like Hou Ken and Rin Ko. Despite his brashness, he inspires deep troop loyalty and earns seasoned generals' respect. He shares a sibling-like rapport with Ka Ryo Ten, frequently bickering yet relying on her strategic mind. His bond with lieutenant and master swordswoman Kyou Kai deepened, culminating in a marriage proposal after China's unification; her answer remains pending. Key military achievements include pivotal roles in the Sanyou Campaign against Ren Pa, the defense of Sai during the Coalition Invasion, and slaying the Bushin Hou Ken at Shukai Plains. Promoted to general after the Gyou Campaign, he leads the Hi Shin Unit through Qin's unification wars. An instinctual-type commander, his battlefield decisions rely on intuition honed during the Battle of Kankoku Pass, not formal tactics. Shin possesses immense physical prowess: superhuman strength shatters stone walls and overpowers elite warriors; exceptional speed and reflexes rival Kyou Kai's agility; peerless stamina enables fighting through severe injuries. He adapts rapidly in combat, employs a signature jumping attack, and heals faster than ordinary soldiers. His core motivation remains becoming the "Greatest General under the Heavens" to honor Hyou. This evolved into supporting Ei Sei's dream of unifying China, viewing himself as the king's "unbreakable sword." He vows to prevent atrocities like the massacre at Chou Hei, reflecting his belief in humane warfare. Historically mirrored by Li Xin, who participated in Qin's invasions of Zhao, Yan, and Qi, becoming Count of Long Xi, Shin's trajectory includes acquiring a residence in Fuuri. Shin's journey traces a path from reckless orphan to respected general, carrying the wills of fallen mentors like Ou Ki and Duke Hyou while maintaining his idealistic core.