Underground poster
Where to stream

Underground

20261h 32mMovieMysteryHorror

Seung-hyeon, a construction team leader with PTSD, is ordered to inspect Dohak Station, where a fatal accident halted work years ago. Inside the eerie, abandoned tunnels, he and Joo-young encounter two mysterious workers and become lost…

DirectorChoi Woo-sik

Where to watch

Expected on OTT
around October 1, 2026

Released in cinemas on August 13, 2026. A prediction based on the typical 6–8 week theatrical-to-streaming window — not a confirmed date. Get the WhichOTT app to be notified the moment it lands.

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Cast · Directed by Choi Woo-sik

SHShin Hyun-soo
Shin Hyun-soo
Kwon Seung-hyeon
LYLee Yu-ji
Lee Yu-ji
Lee Joo-young
KGKo Gun-han
Ko Gun-han
Yang Jung-kook
PHPark Hyun-young
Park Hyun-young
MSMun Seong-bok
Mun Seong-bok
JHJung Hyung-suk
Jung Hyung-suk
HSHong Seong-pyo
Hong Seong-pyo

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Underground — streaming FAQ

Which OTT platform streams Underground?

Underground isn't streaming anywhere in Canada yet.

Is Underground on Netflix?

No, Underground is not on Netflix in Canada as of August 2026.

Is Underground on Amazon Prime Video?

No, Underground isn't on Amazon Prime Video in Canada right now.

Where can I watch Underground for free?

Underground isn't streaming in Canada yet, so there's no way to watch it free at the moment.

What is the OTT release date for Underground?

Underground hasn't started streaming in Canada yet. Based on the typical 6–8 week theatrical-to-streaming window, we estimate it will arrive around October 1, 2026. This is a prediction, not a confirmed date.