They aren't necessarily frightening, but do essentially fit the entire horror genre to a certain degree.
Shokuzai (2012)
Rating: 9.0/10
Border (2014)
Rating: 8.5/10
The Guest (2018)
Rating: 10/10
The Fearless (2019)
Rating: 10/10
The Cursed (2020)
Rating: 9.5/10
Ju-on: Noroi no le (2020)
Rating: 9.0/10