The granddaughter of the Imperial Hospital's chief physician and Jiang Miao's longtime rival. She is petty, resentful, and enjoys taunting Jiang Miao. She is discussing marriage with the Jiang family's second son. During the confrontation, Jiang Miao uses sorcery on her, causing Su Yue'er to bite her tongue half off. She is described as having a roundworm-like resentment.
