During the Eastern Han's turbulent era, young Dou Ling survives her family's massacre by General Zhang Huan and eunuch leader Cao Jie. Adopting the identity of warrior Yanhua to infiltrate the eunuch-dominated玄衣阁, she navigates court intrigue while plotting vengeance. Her rising prominence draws suspicion, but Zhang Huan's sacrificial death clears her path. In a masterstroke, she exposes Cao Jie's treason, only to learn Emperor Liu Hong himself orchestrated the original purge.