- Ra Mi-ran
- Mi-young
- Lee Sung-kyung
- Ji-hye
- Yoon Sang-Hyun
- Ji-cheol
- Sooyoung Choi
- Jang-mi
- Jo Byeong-gyu
- Junior detective
- Seol Chang-hee
- Seo-Jin's doctor
- Ahn Chang-hwan
- Kang Sang-doo
- Kim Do-wan
- Chan-young
- Sung Dong-il
- Chief of felony crime squad
- Jung Doo-won
- Single male club-goer
- Wi Ha-joon
- Woo-joon
- So Hee-jung
- Seo-jin's mother
- Kang Hong-Seok
- Yong-suk
- Jo Hye-joo
- Soo-bin
- Yeom Hye-ran
- Department head
- Lim Hyun-sung
- Cyber crime police officer
- Ok Ja-yeon
- New Pacific female suicide victim
- Ahn Jae-hong
- Big guy in front of club
- Su-Ji Jeong
- Female police officer (epilogue)
- Kim Jun
- Chan-woong (Juvenile)
- Lee Jung-min
- Chae Sook-hee
- Ha Jung-woo
- Motel desk clerk
- Gwang-Sup Kim
- Shinchon sunglasses man
- Jeon Kwang-jin
- Reporter 3
- Chris Lyon
- Carmelo
- Jack Lyons
- JD the Tatooist
- Kim Min-kyeong
- Woman and youth division detective
- Deanthony Nelson
- Arabian subordinate 1
- Lee Re
- Ji-hye (Juvenile)
- Ahn Seong-bong
- Big man
- Park So-eun
- Seo-jin
- Han Soo-hyun
- Detective Kwak
- Jun Suk-ho
- Detective Oh
- Seo Suk-Kyu
- Truck driver
- Kim Tae-joon
- Criminal affairs division civil petitioner
- Anupam Tripathi
- Arab subordinate 3
- Joo Woo-jae
- Phillip
- Bae Yoo-ram
- High school student 1 with helium balloon
