What to expect
The Fin (2026)
It shares its release window with The Love Hypothesis, so expect the two fanbases to be reacting side by side.
It hits the big screen on September 26, 2026.
Reactr / Trailer Reactions / The Fin
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In Theaters · September 26, 2026
The Fin
Trailer Reactions
Fantasy · Science Fiction · Thriller
A dying merman asks a friend to give his remains to his daughter, hiding amongst the humans. Tasked with this dangerous journey, the merman secretly heads to the land of humans. He is chased by a new civil servant recruit fueled by curiosity and hatred.
Free · no editing · camera or voice only · the clip is yours to post
The Trailer
The The Fin trailer, ready when you are
Dropped August 9, 2025
The cast
Who you’ll see in the trailer
On screen, it is Yeon Ye-ji, Kim Pureum and Goh-Woo carrying the story. Yeon Ye-ji plays Mia.
Yeon Ye-ji
as Mia
Kim Pureum
as Su-jin
Goh-Woo
as Omega
Jeong Young-do
Maeng Joo-one
as Su-jin's mother
Moon Hye-in
as Thief
Woo Seo-yeon
as Official
Behind the camera
The history behind The Fin
Moonstone Pictures, Seesaw Pictures and Essential Filmproduktion are behind the production. Park Sye-young is in the director’s chair. It clocks in at 1 hour 24 minutes.
Why this one is worth it
This trailer was made to be reacted to
Fantasy trailers sell a world in two minutes. The moment it clicks for you is the moment worth keeping.
By opening weekend everyone will have a take. The reactions that matter are the ones recorded before the takes calcify.
Reactions on Reactr
Be one of the first to react
Reaction clips for The Fin will appear here as Reactors share them. The Reactr recorder is free for creators: watch the trailer, record on camera or voice only, and the finished clip is yours to post on your own TikTok, Reels, or Shorts channel.
Record the first reaction →FAQ
The Fin: quick answers
How do I make my own The Fin reaction video?
Open the reaction recorder on your phone at reactr.film/studio/the-fin, choose camera or voice only, and press record while the trailer plays. Reactr captures your reaction and gives you a share-ready clip when the trailer ends. It is free.
Do I have to be on camera?
No. Voice Reaction mode records your commentary with the microphone only: the camera stays off, no face is recorded, and you still get a share-ready clip for your channel.
When does The Fin come out?
The Fin is scheduled to open in US theaters on September 26, 2026. Dates can shift, so check back for updates.
Who stars in The Fin?
Yeon Ye-ji, Kim Pureum, Goh-Woo, Jeong Young-do and Maeng Joo-one lead the cast, directed by Park Sye-young.
Is Reactr free?
Yes. Recording reaction clips on Reactr is free, with no paywall on the finished clip. You own your clip and can post it to TikTok, Reels, Shorts, or anywhere else. Reactr makes money from studios and sponsors, not from creators.
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Your first reaction only happens once
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