Originally named Sheng Xiaoyu, the biological daughter of Zhou Dahua and the director of the meat processing plant. She was switched at birth with Zhao Qianyu and raised by the Zhao family, where she was renamed Zhao Xiaoyu. She is described as chubby and average-performing academically. She accepted the switch back gracefully and expressed that they are just switching back, not cutting off their relationship. She has two older brothers who dote on her.
