First Man: Cast
Hahm Eun-jung
Oh Jang-mi / Ma Seo-rin
Oh Hyun-kyung
Chae Hwa-young
Yoon Sun-woo
Kang Baek Ho
Park Geon-il
Kang Jun Ho
Kim Min-seol
Jin Hong Ju
Jeong So-yeong
Jung Suk Hui [Jang Mi and Seo Rin's biological mother]
Kim Hak-seon
O Bok Gil [Jang Mi's adoptive father]
Lee Hyo-jeong
Ma Dae Chang [Seo Rin's grandfather]
Lee Ki-chang
O Tae Pyeong [Jang Mi's brother]
Lee Jae-hwang
Lee Gang Hyeok [Hwa Yeong's confidant]
Jung Chan
Kang Nam Bong [Baek Ho and Jun Ho's father]
Kim Sun-hye
Yeom San Wol [Hong Ju's mother]
Choi Ji-yeon
Han Yeong Ja [Baek Ho and Jun Ho's mother]
Kim Young-pil
Ma Dong Seok [Jang Mi and Seo Rin's biological father]