Ra Mi-ran

as Park Mi-young

Lee Sung-kyung

as Cho Ji-hye

Yoon Sang-hyun

as Jo Ji-chul

Sooyoung Choi

as Yang Jang-mi

Yeom Hye-ran

as Chief Civil Service Officer

Wi Ha-jun

as Woo-jun

Joo Woo-jae

as Philip

Kang Hong-suk

as Yong-seok

Kim Do-wan

as Chan-young

Jun Suk-ho

as Detective Oh

Cho Byeong-kyu

as Youngest Detective

Lee Jung-min

as Chae Sook-hee

Ha Jung-woo

as Motel Staff

Sung Dong-il

as Hwang Bok-hyun

Lee Re

as Young Ji-hye

Ahn Seong-bong

as Big Man

Baek Seung-hwan

as Police Chief

So Hee-jung

as Se-jin's Mother

Kim Min-kyung

as Youth Division Detective

Jo Hye-joo

as Soo-bin

Jack Lyons

as JD the Tatooist

Anupam Tripathi

as Arabian Subordinate

Choi Byung-yoon

as Club Staff

Limm Yea-eun

as High School Student

Ahn Chang-hwan

as Kang Sang-doo

Choi Hye-jin

as Back Street Nostalgic Girl

Han Soo-hyun

as Detective Kwak

Kim Han-sang

as Past Citation Moderator

Park Se-jin

as Girl Cop

Lim Hyun-sung

as Cyber Investigations Police

Park So-eun

as Seo-jin

Chris Lyon

as Carmelo

Seo Suk-kyu

as Truck Driver in Accident

Ahn Jae-hong

as Happy Balloons Boss

Kim Jun

as Chan-woong

Seol Chang-hee

as Seo-jin's Doctor

Kim Tae-jun

as Criminal Affairs Division Civil Petitioner

Bae Yu-ram

as Helium Balloon High Schooler

Ok Ja-yeon

as New Pacific Suicide Female Victim

Jeong Doo-won

as Flirty Man at Club

Kim Gwang-seop

as Shinchon Sunglasses Man

Kim Chul-hwan

as Helium Balloon High Schooler

Kim Ji-na

as Former Female Taskforce

Song Ji-hyuk

as Happy Balloon University Student

Lee Moon-bin

as Guardhouse Conscripted Policeman

Gambhir Man Shrestha

as Arab Owner of Big-sized Clothes Store