Full cast of The First Man

Ham Eun-jung

Oh Jang-mi / Ma Seo-rin

140 episodes

Oh Hyun-kyung

Chae Hwa-young

140 episodes

Yoon Sun-woo

Kang Baek Ho

140 episodes

Park Geon-il

Kang Jun Ho

140 episodes

Kim Min-seol

Jin Hong Ju

140 episodes

Jeong So-yeong

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

140 episodes

Kim Hak-seon

O Bok Gil [Jang Mi's adoptive father]

140 episodes

Lee Hyo-jeong

Ma Dae Chang [Seo Rin's grandfather]

140 episodes

Lee Ki-chang

O Tae Pyeong [Jang Mi's brother]

140 episodes

Lee Jae-hwang

Lee Gang Hyeok [Hwa Yeong's confidant]

140 episodes

Jung Chan

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

140 episodes

Kim Sun-hye

Yeom San Wol [Hong Ju's mother]

140 episodes

Choi Ji-yeon

Han Yeong Ja [Baek Ho and Jun Ho's mother]

140 episodes

Kim Young-pil

Ma Dong Seok [Jang Mi and Seo Rin's biological father]

140 episodes

Ahn Joo-in

Yang Geom-sun [Maid ]

140 episodes

Han Si A

Tae Suk [Young]

4 episodes

Lee Myung Hee

[Landlady]

2 episodes

Lee Da-yeon

[Luxury store employee]

1 episode

Lee Seop

[Actor]

1 episode

Jeong Yeo-reum

Oh Tae-sook

1 episode

Yoon Jae-jin

[OB-GYN doctor]

1 episode

Kang Myung-soo

[Gardener]

1 episode

Kim Ra Hui

[Tae Suk's daughter]

1 episode