Kou emerges from a modest merchant family, selected for her youthful beauty to enter the royal harem of Qin. Initially disoriented by her new role, she gradually forms a bond with King Ei Sei through repeated encounters in his chambers, her loyalty solidifying when she survives a near-fatal stabbing to expose an assassination plot against him. Her resolve to deliver a warning despite mortal wounds underscores her tenacity. As their connection intensifies, it evolves into intimacy, resulting in her pregnancy. Amid the chaos of the Coalition Invasion, she anxiously monitors Ei Sei’s fate, prepared to evacuate under his orders if defeat looms. Their parting before a pivotal battle includes a fervent vow to reunite—a promise honored after his triumph. She births their daughter, Rei, to royal acclaim, marking her ascent within the court. Petite in frame, Kou’s dark brown twin pigtails and green eyes contrast her unassuming demeanor, occasionally revealing subtle allure. The scar on her abdomen, a remnant of her brush with death, serves as a testament to her grit. Though timid and self-effacing, she displays unyielding fortitude in crises, her calming presence easing Ei Sei’s burdens. Her humble origins and secretive pregnancy during political unrest shape her cautious navigation of court dynamics, including tensions with the Queen Mother and Ryo Fui’s faction. Initially reticent, she cultivates a quiet authority, harmonizing motherhood with royal duties. Post-conflict, she embraces a tranquil existence, often seen nurturing Rei in mundane yet poignant moments, symbolizing her transition from survival to serenity.