Romi (voice)
Lee Ji-hyun
Heartsping (voice)
Jo Kyoung-i
Lalaping / Maid / Stickping (voice)
Jang Ye-na
Mr. Bus Stop / Freezeping (voice)
Um Sang-hyun
Heart King / Monster Truthping (voice)
Choi Nak-yoon
Belita / Girl (voice)
Yeo Min-jeong
Stella (voice)
Hong So-young
Dr. Monziu / General Teenieping (voice)
Hong Beom-gi
Marie (voice)
Kim Ha-yeong
Liam / Butler (voice)
Ryu Seung-gone
Truthping (voice)
Cho Hyun-jung
Happying / Young Liam / Girl's Mom (voice)
Kim Eun-ah
Theme Song Performance
WINTER
Writer
Naruhisa Arakawa
Director
Kim Su-hoon
Executive Producer
Producer
Song Mi-seon
Shin Hyeon-deok
Min Seul-ki
Sound
Jo Seong-hee
VFX Supervisor
Kim Dae-yeol
Original Story
Ryota Yamaguchi
Music
Kim Tae-ho
Animation Director
Kim Young-jin
Kang Byeong-chae
Art Direction
Seo Bo-guk
Production Design
Im Ji-eun
Kim Yu-jin
Storyboard
Jo Yeong-gwang