Actually I enjoy this kind of psychological thriller but I hate it when the lead character and other protagonist characters are a bit stupid, slow and weak. I love to see the battle of wits, when both the protagonist and antagonist are smart. It's more exciting and less frustrating. To watch this stupid, slow and weak lead character made me want to slap him on the face. I can even predict the story line and how it ended (it's familiar for me, there are some books & dramas with this kind of plot line). Well, the lead character is already a bit psychotic from the very first episode.
There's some plot holes & illogical action/reaction. It annoyed me when he didn't tell the police officer that the landlady was lying about the foreign tennant missing since she told a different story to him (that he was killing himself). That's a big deal, dude. Someone's live is at stake. He felt the strangeness in his studio (incl. the landlady) yet he didn't bother to tell the police who already have suspicion. And about the laptop, since he had suspicion that someone broke into his room, why he didn't put a password and keep the laptop in a drawer instead.
Another thing that bothered me is why has never occurred to him to get out of the studio amidst all the strangeness? Like, isn't the most important thing in the world is to be able to have a good sleep? He keep questioning the strangeness around him but never thinking about how to get out of it. He can go easily solve the problem in the first 5 episodes if he's a quick thinking.
Notes: credit to all actors who played the strange and freak people in this drama, they're convincing and really annoying.. 😅