Seong-mo

Shin Seok-ho

Sang-guk

Ha Sung-guk

Sangguk

Ha Seong-guk

Nam-hui

Kim Seung-yoon

Namhee

Kim Seung-yun

Voice on phone and song

Min-Hee Kim

Seongmo's Ex-Girlfriend (voice)

Kim Min-hee

Kim So-ryeong