Kim Riwon (김리원) is a South Korean singer, actress, and model under M25. She participated in the survival show My Teenage Girl, and in the finale, she ranked 5th overall, making her a member of CLASS:y. Kim Riwon (김리원) is a South Korean singer, actress, and model under M25. She participated in the survival show My Teenage Girl, and in the finale, she ranked 5th overall, making her a member of CLASS:y.