A former companion from the Longnan military camp who followed Song Yiqiu to the capital. She has been undercover in the Song estate for almost half a month, posing as a maid. She is described as Deputy General Bai, undefeated across Longnan. She is loyal to Song Yiqiu, sharp-eyed, and experienced in interrogating spies. She noticed that Qingzhu's feigned madness seemed too skilled to be genuine.
