4th Period Mystery
4th Period Mystery streams in the US free with ads on The Roku Channel, as of October 6, 2026.
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.
Where to watch
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The Roku Channel
Amazon Video
