Cast

Lee Ji-hyun

Romi (voice)

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Jo Kyoung-i

Heartsping (voice)

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Choi Nak-yoon

Heart King / Monster Truthping (voice)

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Yeo Min-jeong

Belita / Girl (voice)

Hong So-young

Stella (voice)

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Hong Beom-gi

Dr. Monziu / General Teenieping (voice)

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Kim Ha-yeong

Marie (voice)

Ryu Seung-gone

Liam / Butler (voice)

Cho Hyun-jung

Truthping (voice)

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Kim Eun-ah

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

Crew

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Kim Su-hoon

Director (Directing)

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Min Seul-ki

Producer (Production)

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Song Mi-seon

Producer (Production)

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Shin Hyeon-deok

Producer (Production)

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Kim Su-hoon

Executive Producer (Production)

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Jo Seong-hee

Sound (Sound)

WINTER

Theme Song Performance (Sound)

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Kim Dae-yeol

VFX Supervisor (Visual Effects)

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Ryota Yamaguchi

Original Story (Writing)

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Kim Young-jin

Animation Director (Visual Effects)