해피 버스데이

Jin Ji-hee

Park Min-seo (young)

Bae Doona

Park Min-seo (adult)

Song Sae-byuk

Uncle Hwan

Yoon Se-a

Min-seo's mother

Ryu Seung-su

newscaster 1

Lee Young-eun

newscaster 2

John D. Kim

former NASA researcher

Kevin Lee

government employee

Oh Jae-min

tv host 1

Kim Ok-jin

tv host 2

Jung Chul

model 1

Jo Seung-min

model 2