Kang Ha-neul as Jin-seok

Kim Moo-yul as Yoo-seok / Choi Seong-uk

Moon Sung-keun as Jin-seok's Father / Mr. Park

Na Young-hee as Jin-seok's Father / Madam Min

Nam Myung-ryeol as Professor Choi

Lee Na-ra as Professor Choi's Wife

Jung Chan-bi as Girl

Choi Go as Young Yoo-seok

Bae Seong-il as Questionable Man 1

Lee Soon-won as Questionable Man 2

Byeon Dong-joon as Questionable Man 3

Kang Sin-goo as Jin-seok's Real Father / Precinct Policeman 4

An Min-young as Jin-seok's Real Mother

Park Jae-yeong as Jin-seok's Real Brother

Jeong Taek-hyeon as High School Yoo-seok

Park Chae-ik as Mover

Kwon Jae-hwan as Precinct Policeman 1

Moon Seong-pil as Precinct Policeman 2

Eom In-woo as Precinct Policeman 3

Kim Tae-eung as Precinct Policeman 5

Shin Gi-rok as Precinct Conscripted Policeman

Oh Hyeon-soo as President Song

Park Kyung-chan as Employment Agency Director

Lee Dong-geun as First Aid

Han Tae-eun as Emergency Room Nurse 1

Ahn Yoo-jin as Emergency Room Nurse 2

Cho Han-na as Hallway Nurse

Han Da-eun as Hospital Room Nurse

Lee Seong-woo as Arresting Detective 1

Lee Dong-jin as Arresting Detective 2

Yeon Je-hyung as Police Precinct Student 1

Kim Hyeon-mok as Police Precinct Student 2

Yoo In-soo as Police Precinct Student 3

Kim Hyeon-chang as Drunkard

Kang Hak-soo as Loan Shark 1

Lee Chang-hoon as Loan Shark 2

Jo Hong-woo as Loan Shark 3

Lim Jung-min as Questioning Detective

Yoo Jae-sang as Hardware Store Owner

Park Yoon-sik as Real Estate Agent

Oh Min-jeong as Real Estate Agent

Jeong Mi-kyeong as Neighborhood Auntie

Jang I-soo as Man in His 60s

Jeon Sang-jin as Criminal Investigator 1

Kim Joo-hwang as Criminal Investigator 2

Ma Jeong-pil as Psychiatrist

Lee Hee-seong as Briefing Detective

Lee Seung-yong as Driver in Accident

Kang Shin-gu as The Real Jin-seok Bu/Police Station Officer 4