The Eldest Mistress of the Wu'an Marquisate, wife of Xiao Yujue. She is the stepdaughter of Xiao Zhi. She is described as cruel and abusive toward Wan Tang. In Wan Tang's previous life, Song Zhiyun first guarded against Wan Tang getting close to Xiao Yujue, then after becoming pregnant, pushed Wan Tang into a fire to secure her favor. She tortured Wan Tang repeatedly—beating her, pricking her fingertips with needles—and eventually had her wrapped in a straw mat and thrown into the Mass Burial Ground. She made Wan Tang search a pond for a hairpin in late autumn, causing Wan Tang to fall into a high fever.
