Zhōu Xīn Yǔ, more commonly referred to as simply Xinyu, is a Chinese singer and dancer under MODHAUS. On July 2, 2023, she was introduced as S15, the fifteenth member of the 24-member girl group tripleS. She attended Berklee College of Music and is also a former SM Entertainment and Yuehua Entertainment trainee. Aside from being fluent in Mandarin, she speaks Korean and English.