Hello, I'm into horror and Ive watched a few korean horror movies/series the last couple of years:

These ones I've enjoyed alot:
Hellbound (2021)
All of Us Are Dead (2022)
A Tale of Two Sisters (2003)
Sweet Home (2020)
Suicide Circle (2002)
Squid Game (2021)
Imawa no Kuni no Alice (2020)

Please feel free to recommend me any, I can stomach anything.  

Whispering Corridors movies

Unborn But Forgotten

Arang

The Cat

Hansel&Gretel

The Grotesque Manson is pretty good. A collection of horror stories that happen in one building.

For the best Korean horror series and movies, Train to Busan is a popular choice for movie, while Kingdom is a great series. Gyeongseong Creature is also worth checking out

revenant

the gues

exhuma

the witch

ghost detective

who are you 2013

black

lovely horribly

spellbound

master's sun

oh my ghost

oh my ghost