Composer
Director
Executive Producer
Screenwriter
Main Role
- Moon Geun Young Main Role
- Kim Seon Ho Main Role
- Jung Eugene Main Role
- Ki Do HoonKim Woo HyukMain Role
Support Role
- Jo Jae YoonLee Man Jin [Subway Investigator]Support Role
- Ahn Seung GyunKang Soo Ho [Rookie Subway Investigator]Support Role
- Song Ok SookKim Hyung Ja [Police Commissioner]Support Role
- Nam Ki AeHan Ae Shim [Ji Suk's mother]Support Role
- Lee Joon HyukChief Gong [Chief inspector]Support Role
- Song Sang EunPark Mi Hyun [Nurse]Support Role
- Ahn Sang WooJeon Won Chul [PR Chief]Support Role
- Kim Jung YoungChoi Kyung Hee [Part-timer / Sae Rom's grandmother]Support Role
- Kim Gun WooHan Tae Woong / Kim Yi Joon [Grasshopper group member]Support Role
- Lee Jae WooKim Hyung Soo [Grasshopper group member]Support Role
- Lee Hong NaeGoo Dong Man [Grasshopper group member]Support Role
- Yong Jin[Detective]Support Role
- Na Do YoolPark Jung HoonSupport Role
- Jeong Yoon Hee[Reporter] (Ep. 16)Support Role
Guest Role
- Woo Jeong Won[Hand out flyers at subway station] (Ep. 10)Guest Role
- Han Ji Sang[Serial pervert] (Ep. 1)Guest Role
- Oh Hee Joon[Serial pervert] (Ep. 1)Guest Role
- Choi Min Chul(Ep. 2)Guest Role
- Min Kyung Jin(Ep. 2)Guest Role
- Park Ho SanChoi Do Cheol (Ep. 3-4)Guest Role
- Shin Mi Young[Do Chul's wife](Ep.3-4)Guest Role
- Lee Joo WonChoi Ji Hwan [Do Chul's son](Ep. 3-4)Guest Role
- Yang Hyun Min"Gold Watch'' [Loanshark] (Ep. 3-4)Guest Role
- Jung Min Sung"Bass" [Loanshark] (Ep. 3-4)Guest Role
- Yoo Hyung Kwan[Subway officer] (Ep. 4, 8-10, 14)Guest Role
- Oh Dae HwanKim Won Tae [Boxer] (Ep. 4-5)Guest Role
- Baek Seo YiMa Hye Jin [Won Tae's fiancee] (Ep. 4-5)Guest Role
- Jung Da Sol"Avocado" (Ep. 5-7)Guest Role
- Park Ji YunChoi Mi Ra [Girl who lost her wallet] (Ep.6-7, 9-14)Guest Role
- Jeon Jin Ki[Bakery shop owner] (Ep.8-9)Guest Role
- Lee Se HeeMadonna [Soo Ho's blind date] (Ep. 8-9)Guest Role
- Hong Seo JoonMr. Cha [Subway security chief ] (Ep. 9-10)Guest Role
- Kang Min TaeGwa Do [Serial robber] (Ep.16)Guest Role
- Kim Mo Bum Guest Role
- Kim Mi Hye[News Anchor] (Ep. 9)Guest Role
- Byun Gun Woo[NFS staff](Ep.12)Guest Role
- Song Chang Gyu[Chinese restaurant owner] (Ep.8)Guest Role
- Kim Han Sang[Broker, buys stolen goods] (Ep 12)Guest Role
- Yoo Yong Guest Role
- Park Han SolPark Yoo Mi (Ep.5-6)Guest Role
- Mok Ji Su[Psychiatric ward nurse] (Ep. 14)Guest Role
- Kim Wang Do[Detective, Dangsan Station Subway]Guest Role
- Park Won Ho[Paparazzi]Guest Role
- Gi So Yoo[Lee Man Jin's third daughter]Guest Role
- Nam Tae Hoon[Reporter]Guest Role
- Cho Seok In[Gang member] (Ep. 2)Guest Role
- Kim Geun Young[Relative middle-aged woman]Guest Role
- Ahn Soo Bin[Volunteer in cap with wings]Guest Role
- Lee Gyoung Ho[Dangsan University detective]Guest Role
- Choi Woo Ri[Kidnapper red shoes]Guest Role
- Hong Ji Eun[Reporter] (Ep. 1-2, 16)Guest Role
- Park Soo Yeon[Club woman]Guest Role
Unknown
- Heo Dong Soo Unknown
- Kim Cha Yoon Unknown
- Kim Na Hee Unknown
- Kwon Yoo Na Unknown
- Jung Yi Rang Unknown
- Go Bong Goo Unknown
- Lee Han Joo Unknown
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