4th Period Mystery poster
Where to stream

4th Period Mystery

5.820091h 26mMovieCrimeMysteryThriller

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…

DirectorLee Sang-yong
WriterShin Jai-ho
ProducersKu Jeong-hoe·Seo Myeong-jin

Where to watch

The Roku ChannelThe Roku Channel
Availability shown for United States · rights vary by country

Cast · Directed by Lee Sang-yong

YSYoo Seung-ho
Yoo Seung-ho
Han Jung-hoon
KSKang So-ra
Kang So-ra
Lee Da-jeong
JS
Jo Sang-geun
Kim Tae-gyoo
JJ
Jeon Jun-hong
Byeong-soo
JSJeong Seok-yong
Jeong Seok-yong
Kang Gook-man
PCPark Cheol-min
Park Cheol-min
Crazy
RYRie Young-zin
Rie Young-zin
Yun Sang-mi
KD
Kim Dong-beom
Do-il
JYJo Yoon-hee
Jo Yoon-hee
Hong Ju-hee
LC
Lee Chan-ho
Tak Teuin
MKMin Kyung-jin
Min Kyung-jin
Headmaster
ISIm Soo-hyang
Im Soo-hyang
Fan

More from Yoo Seung-ho · Lead actor

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See all fromYoo Seung-ho

More from Kang So-ra · Co-star actress

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4th Period Mystery — streaming FAQ

Which OTT platform streams 4th Period Mystery?

4th Period Mystery is streaming on The Roku Channel in United States, and available to rent or buy on Amazon Video. It's not currently on Netflix.

Is 4th Period Mystery on Netflix?

No, 4th Period Mystery is not on Netflix in United States as of September 2026. It's currently on The Roku Channel.

Is 4th Period Mystery on Amazon Prime Video?

4th Period Mystery isn't included with a Prime Video subscription in United States, but you can rent or buy it on Amazon Video.

Where can I watch 4th Period Mystery for free?

4th Period Mystery is available to stream free (with ads) on The Roku Channel in United States.