[INFO]
Siyeon has credits for the chorus of 날아올라 (Fly high), Wake up, Sleep-walking and 괜찮아! Yoohyeon has credits for Sleep-walking chorus.
Edit: This simply means they sang the background vocals.
[INFO]
Siyeon has credits for the chorus of 날아올라 (Fly high), Wake up, Sleep-walking and 괜찮아! Yoohyeon has credits for Sleep-walking chorus.
Edit: This simply means they sang the background vocals.