Xinyu (Hangul: 신위; Mandarin: 心语) is a Chinese idol under MODHAUS and the fifteenth revealed member of tripleS. She was revealed as S15 on July 2, 2023. She currently majors in Contemporary Theatre at Boston Conservatory at Berklee. She is also a former SM Entertainment and Yuehua Entertainment trainee. Aside from fluent Mandarin, she speaks Korean and English.