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About
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.
Director
Lee Sang-yong
Producer
Ku Jeong-hoe
Studio
Sway Entertainment, Lotte Entertainment
Original Title
4교시 추리영역
Original Language
Korean
Where to Watch
Region
Amazon Video
Rent from
HD
$4.99
Amazon Video
Buy from
HD
$12.99
The Roku Channel
Stream with ads
HD
Included
Prices last updated September 30, 2026. Pricing and availability may vary by region.
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Cast
Full credits →Y
Yoo Seung-ho
Han Jung-hoon
K
Kang So-ra
Lee Da-jeong
J
Jeong Seok-yong
Kang Gook-man
P
Park Cheol-min
Crazy
R
Rie Young-zin
Yun Sang-mi
K
Kim Dong-beom
Do-il
J
Jo Yoon-hee
Hong Ju-hee
M
Min Kyung-jin
Headmaster
I
Im Soo-hyang
Fan
K
Kim Young-woong
History teacher
J
Jung Young-ki
Student in Grade 2 Class 5
O
Oh Jin-ha
Student in Grade 2 Class 5
C
Choi Hong-rak
Student in Grade 2 Class 5
K
Kim Min-su
Virtual Criminal
