The First Responders S1-S2

Rae-won Kim

Jin Ho-gae

Ho Joon Son

Bong Do-jin

Gong Seung-Yeon

Song Seol

Kang Ki-Doong

Gong Myeong-pil

Hyun-chul Seo

Baek Cham (Detective team leader)

Woo Mi-Hwa

Dok Ko-soon (Taewon fire station)

Lee Do-yeop

Ma Tae-hwa

Son Ji-Yoon

Yoon Hong (NFS)

Hwang Young-Hee

Hee-sook

Jung Wook-jin

Choi Seok-doo

Sung-woo Jeon

Han Se-jin

Jae-Hwan Choi

Choi Do-joon (Delivery driver)

Sang-hwa Yoon

Yang Sang-man

Lee So E

Kim Hyeon-seo

Moo-Seong Choi

Seok Moon-goo

Bo Ra-na

Sang-woo's mother

Bo Ra-na

Kwak Soon-ja (Unit 503's resident)

Hong Dong-Yeong

Kang Do-ha (young)

Yoon Seok Hyun

Cho Doo Chil