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Lee Ji-hyunRomi (voice)
Jo Kyoung-iHeartsping (voice)
Choi Nak-yoonHeart King / Monster Truthping (voice)
Yeo Min-jeongBelita / Girl (voice)
Hong So-youngStella (voice)
Hong Bum-kiDr. Monziu / General Teenieping (voice)
Kim Ha-yeongMarie (voice)
Ryu Seung-goneLiam / Butler (voice)
Cho Hyun-jungTruthping (voice)
Kim Eun-ahHappying / Young Liam / Girl's Mom (voice)
Jang Ye-naLalaping / Maid / Stickping (voice)
Um Sang-hyunMr. Bus Stop / Freezeping (voice)
