Prince Murong Jinghe of the Great Yan Dynasty led his Weibei Army to reclaim Qingzhou. However, after his victory, a devastating fire broke out, leading to rumors that he burned the city in revenge for its betrayal, earning him the nickname "Butcher General." In the blaze, a young girl named Mei Lin lost her family and vowed revenge. She joins the Shadow Works, undergoes brutal training, and is assigned to assassinate Murong Jinghe. Disguised as part of a marriage alliance, she waits for her chance, unaware that Murong Jinghe himself orchestrated her path of vengeance...