FoJ Gamera977 suggested Sector 7. There was a time (I’m sure I’ve said this before) when I looked at my thousands of DVDs and Blu Rays and thought, why did I bother. Everything’s on streaming. That’s not true, though. I know Sector 7 used to be available somewhere, but now it’s not on Amazon Prime or Netflix or Hulu. You can rent it for $3 on Amazon, though, so that’s pretty reasonable.
Quoth Gamera: “the movie is basically the Korean version of ‘Deepstar 6’ aka a crew of wildcatters on an oil rig platform go up against a nasty sea monster. Good film if not great, my only real issue is you could cut about twenty minutes out of it- I was tempted to yell at the screen ‘Please monster just DIE already!”
I will say that a lot of Korean films do seem long to me, although then you have something like Parasite which is perfect.