Yonder

Shin Ha-kyun

as

Jae-hyeon

Han Ji-min

as

Cha Yi-hoo

Lee Jung-eun

as

Siren

Jung Jin-young

as

Doctor K

Bae Yoo-ram

Cha Soon-bae

Yoon Yi-reh

as

Peach

Choi Dae-sung

Choi Hee-seo

as

Seri (voice)

Kim So-min

as

Choi Han-gi's ...