이지현

Romi (voice)

조경이

Heartsping (voice)

최낙윤

Heart King / Monster Truthping (voice)

여민정

Belita / Girl (voice)

홍소영

Stella (voice)

홍범기

Dr. Monziu / General Teenieping (voice)

김하영

Marie (voice)

류승곤

Liam / Butler (voice)

조현정

Truthping (voice)

김은아

Happying / Young Liam / Girl's Mom (voice)