Through the Darkness

Oh Seung-hoon (Jo Kang-moo), Kim Yun-seul (Cotton candy girl), Kim Kwan-mo (Undercover cop in drag), Choi Da-young (Nurse), Hwang Jeong-min ('Turtle' supermarket owner), Heo Seon-haeng (Medical examiner), Kim Deok-ju (Hwa-yeon's landlord), Lee Si-young (Neighborhood single mother), Bang Jung-hyun (Detective), Park Jin-young (Doctor), Yoon Hye-ree (Choi Hwa-yeon), Oh Kyung-joo (Bang Ki-hoon)

Oh Seung-hoon (Jo Kang-moo), Yoon Hye-ree (Choi Hwa-yeon), Oh Kyung-joo (Bang Ki-hoon), Oh Hee-jun (Kang Yoo-min), Ko Gun-han (Yang Yong-chul), Moon Dong-hyeok (Moon Tae-soo), Kim Hyun (Hwa-yeon's mother), Jeong Man-sik (Park Dae-woong), Cheon Dong-been (Deliveryman), Noh Ha-yeon (Lee Soo-hyun)

Noh Ha-yeon (Lee Soo-hyun), Lee Ki-seop (Kang Jin-goo), Lee Jong-yoon (Jang Deuk-hok), Bae Seong-il (Detective), Jung Chung-gu (Film developer), Park Yu-mil (Lim Hyun-joo), Lee Jae-eun (Mrs. Kim), Ki Hwan (Soo-hyun's father), Lee Hun-joo (Soo-hyun's mother), Son Young-soon (Lee Chun-young), Woo Jung-kook (Cho Hyun-gil)

Ki Hwan (Soo-hyun's father), Lee Hun-joo (Soo-hyun's mother), Son Young-soon (Lee Chun-young), Woo Jung-kook (Cho Hyun-gil), Jung Young-keum (Hyun-gil's landlord), Choi Nam-wook (Convenience store owner), Han Jun-woo (Gu Young-chun)

Woo Jung-kook (Cho Hyun-gil), Han Jun-woo (Gu Young-chun), Ku Sung-hwan (Hwang Dae-sun), Seo Myung-chan (Han Seok-hoon), Hwang In-jun (Detective), Oh Kyu-taek (Man drinking with prosecutor), Sun Yul-woo (Detective)

Han Jun-woo (Gu Young-chun), Sun Yul-woo (Detective), Hong Ye-ji (Bookstore employee), Kim Joong-hee (Nam Ki-tae)

Han Jun-woo (Gu Young-chun), Sun Yul-woo (Detective), Kim Joong-hee (Nam Ki-tae), Lee Geun-hoo (Kwak Man-hyun), Lee Jae-woo (Detective Kim), Kim Bum-joon (Witness), Yoo Yong (Detective), Lee Dong-kyu (Anchorman), Kim Gyeong-min (Professor An), Seong No-jin (Forensics examiner)

Han Jun-woo (Gu Young-chun), Kim Joong-hee (Nam Ki-tae)

Sun Yul-woo (Detective), Kim Joong-hee (Nam Ki-tae), Kim Gyeong-min (Professor An), Seong No-jin (Forensics examiner), Kim Joo-ah (Columbarium employee), Choi Min-hyeok (Victim), Han Dae-gwan (Victim's father)

Sun Yul-woo (Detective), Kim Joong-hee (Nam Ki-tae), Kim Nak-kyun (Detective), Choi Sol-hee (Yang Ji-sook), Na Chul (Woo Ho-sung)

Lee Cheon-mu (Song Ha-young (young)), Moon Dong-hyeok (Moon Tae-soo), Kim Hyun (Hwa-yeon's mother), Jeong Man-sik (Park Dae-woong), Choi Sol-hee (Yang Ji-sook), Na Chul (Woo Ho-sung), Hong Eun-jeong (Manyeon bus stop woman), Lee Ye-joo (Christmas tree girl), Yoon Ga-i (Lee Cho-won), Noh Eun-ha (ATM woman)

Jeong Man-sik (Park Dae-woong), Na Chul (Woo Ho-sung), Kim Borana (Massage parlor owner), Kim Bong-soo (Ji-sook's father), Kim Bong-hee (Ji-sook's mother)