Mi-young
Ji-hye (as Sung-Kyoung Lee)
Ji-cheol
Jang-mi (as Soo-Young Choi)
Junior detective (as Byeong-gyu Jo)
Seo-Jin's doctor
Kang Sang-doo
Chan-young
Chief of felony crime squad (as Dong-il Sung)
Single male club-goer
Woo-joon
Seo-jin's mother
Yong-suk
Soo-bin (as Hye-Jo Cho)
Department head
Cyber crime police officer (as Hyun-sung Lim)
New Pacific female suicide victim
Big guy in front of club
Female police officer (epilogue)
Chae Sook-hee (as Jung-Min Lee)
Motel desk clerk
Shinchon sunglasses man
Chan-woong (Juvenile)
Woman and youth division detective
Reporter 3 (as Kwang-Jin Jeon)
Carmelo
JD the Tatooist
Arabian subordinate 1 (credit only)
Seo-jin
Ji-hye (Juvenile)
Big man (as Ahn Seong-Bong)
Detective Kwak (as Han Soo Hyun)
Detective Oh
Truck driver
Criminal affairs division civil petitioner
Arab subordinate 3
Phillip (as Joo Woo Jae)
High school student 1 with helium balloon (as Yoo-ram Bae)