The First Man

함은정

Oh Jang-mi / Ma Seo-rin

오현경

Chae Hwa-young

윤선우

Kang Baek Ho

Park Geon-il

Kang Jun Ho

Kim Min-seol

Jin Hong Ju

정소영

Jung Suk Hui [Jang Mi and Seo Rin's biological mother]

김학선

O Bok Gil [Jang Mi's adoptive father]

이효정

Ma Dae Chang [Seo Rin's grandfather]

이기창

O Tae Pyeong [Jang Mi's brother]

이재황

Lee Gang Hyeok [Hwa Yeong's confidant]

정찬

Kang Nam Bong [Baek Ho and Jun Ho's father]

Kim Sun-hye

Yeom San Wol [Hong Ju's mother]