Ei Sei, the 31st King of Qin, was born in Kantan, Zhao during his family's exile. His early life involved severe trauma from physical and emotional abuse by Zhao residents and neglect from his mother, Bi Ki, who later made multiple attempts on his life. This left him emotionally detached, distrustful, and physically numb, believing himself haunted by ghosts like those of the Chouhei massacre. A pivotal shift occurred upon meeting Shi Ka, a black-market merchant in Zhao. She provided refuge and facilitated his escape back to Qin, sacrificing her life to protect him. Her kindness broke his emotional barriers, restoring his ability to feel and reshaping his worldview. He ascended the Qin throne at 13 but lacked full authority until his coming-of-age ceremony at 22. His early reign was dominated by a power struggle against the influential merchant Ryo Fui, who controlled the court and orchestrated plots like the State of Ai rebellion. Ei Sei ultimately defeated Ryo Fui through political maneuvering and decisive action, consolidating his power. Initially cold and pragmatic, Ei Sei displayed ruthlessness, executing the wounded assassin Jo Kan without hesitation despite Shin's willingness to spare him. However, glimpses of care emerged, like carrying the exhausted Shin despite vowing to see him only as a tool. Experiences with Shi Ka and the war orphan Shin fostered significant development. He gradually learned trust and camaraderie, entrusting Shin with reclaiming the Royal Hall during Sei Kyou's rebellion. His leadership evolved during the Battle of Sai, where he donned golden armor, rallied civilians, and fought alongside them to achieve a miraculous defense, solidifying his connection to his people. His core personality combines unwavering resolve with a vision for transformation. He possesses profound charisma attracting loyal followers and demonstrates exceptional oratory skills. His defining trait is an indomitable will focused on unifying China under Qin's banner to end the 500-year Warring States Era. This vision entails dissolving all existing states, including Qin, erasing borders, and establishing a legalist system where uniform laws guarantee equal rights and duties for all citizens, eliminating privilege and discrimination to prevent future conflicts. He openly acknowledges the immense bloodshed this path requires but deems it necessary for lasting peace. Ei Sei's relationships are complex. Shin began as a tool for reclaiming the throne but evolved into his most trusted friend and self-proclaimed "sword" for unification; their bond is reciprocal. He shares a genuine, affectionate relationship with his concubine Kou, mother of his daughter Rei; he confided his traumatic past in her and embraced her despite societal scorn over a facial scar. Rei is a source of deep paternal worry and affection. His half-brother, Sei Kyou, was initially an object of pity and mutual hatred, but Sei Kyou's shift toward respect before death altered Ei Sei's view, leading to a desire for reconciliation. Political alliances shaped him, such as the tense but respectful pact with mountain tribe leader Yo Tan Wa, forged over shared dreams despite historical grievances. Key figures like loyal minister Shou Bun Kun earned his utmost respect and trust. His relationship with his mother, Bi Ki, remained fractured due to her attempts to kill him, though he expressed a sense of responsibility to heal her. Ryo Fui, his primary political rival, was met with hatred tempered by grudging respect. Physically, Ei Sei is a young, thin yet muscular man with black shoulder-length hair, light brown eyes, and pale skin, bearing a striking resemblance to Shin's deceased friend Hyou. He typically wears ornate royal robes and often carries a sword. His most notable alternative appearance occurred during the Battle of Sai, where he wore distinctive golden armor adorned with a dragon symbol on the chest and a long cape, marking his transition into a military commander.