During fourth period, high schooler Da-jeong finds her classmate Tae-gyu dead in a classroom and Jeong-hun standing in front of him with blood on his clothes. In order to stop Jeong-hun from becoming the prime suspect, Da-jeong must help him find the real murderer, who is still inside the school building, under 40 minutes before period four ends.
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Cast
17 people
Yoo Seung-ho
Han Jung-hoon
Known for
I Am Not a Robot
The Way Home
Kang So-ra
Lee Da-jeong
Known for
Doctor Stranger
Dream High
Jo Sang-geun
Kim Tae-gyoo
Also in
Goodbye My Smile
Jeon Jun-hong
Byeong-soo
No other roles listed
Jeong Seok-yong
Kang Gook-man
Known for
Marry My Husband
Black
Park Cheol-min
Crazy
Known for
I Am Not a Robot
Love in the Moonlight
Rie Young-zin
Yun Sang-mi
Known for
Tempted
Memento Mori
Kim Dong-beom
Do-il
Also in
Family
71: Into the Fire
Jo Yoon-hee
Hong Ju-hee
Known for
Tae Guk Gi: The Brotherhood of War
The Producers
Lee Chan-ho
Tak Teuin
Also in
Our School's E.T.
Min Kyung-jin
Headmaster
Known for
Bloodhounds
The Chaser
Im Soo-hyang
Fan
Known for
My ID is Gangnam Beauty
Doctor Lawyer
Lee Sang-yong Director · Shin Jai-ho Writer Mun Ho-jin Cinematographer
First release August 12, 2009 · Produced in South Korea · Production Lotte Entertainment
Production
Sway Entertainment
Production
Lotte Entertainment
Production
South Korea
Produced in
Languages
Original title
4교시 추리영역
Original language
Korean
Spoken on screen
Korean
Release dates
South Korea · August 12, 2009
Theatrical
No release date listed for United States.
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