This sounds exactly like my kind of movie. Not to mention it’s being made by Bong Joon Ho, made one of favourite movies (across all genres); Memory of a Murder.
While his later movies are excellent (Okja, Snowpiercer, Parasite), Memories of a Murder benefits from a more indie vibe, a less polished presentation and a more eclectic style. Check it out if you liked his later movies (I would recommend watching it in Korean with subtitles).
That’s the best time to watch body horror movies, when you’re still impressionable and have a lucid imagination. 😀