Hi can yall help me

Movies
1

A Korean or Japanese movie i cant remember
It’s about a man who found keys to a camera room in his residence and started spying on them
He spy’s on a woman that’s happened to be a serial killer and also spy’s on gay couples and ends on killing each other . I hope i can find this masterpiece again

2

“The Tenants Downstairs” (2016), original Taiwanese title: “Lou xia de fang ke”
It is a Taiwanese movie.

3

Hey, @Zoie98, I noticed that you liked my answer to your movie question. I take this as a confirmation that this is the movie you are looking for.