*SPOILERS*
This series is a must watch for anyone that loves thriller, horror and psychological dramas. It's one of my all time favorite dramas and I think it deserves wayyy more hype. May be slow paced in the start but it builds up to a breaking point later in the drama where you get all the action and good stuff. Absolutely love the acting in this, especially by Im Siwan and Lee Dong Wook. They're amazing at acting like psychopaths lol. I really love how Siwan acts with his eyes and his facial expressions are always really good. His character goes through this slow paced mental breakdown where he just gets more and more paranoid and afraid, which then turns into anger and frustration. He's on edge, nobody belives him and you really get to feel that frustration with him. All in all I think Im Siwan nailed that role and no one could've replaced him on that.

Another thing i love is the suspense and the way everything builds up perfectly. Every character has a certain presence so it doesn't feel like everything revolves around the main characters. The acting felt really natural and real like we're just watching into someone's daily life. The only character I think could've been better was Yoo Ki-Hyeok . I feel like he wasn't a character that was memorable. They could've had him and Jungwoo fight over who gets to stay or something like that so he at least added something to the drama other than messing with the 'leader' role. And his creepy psychopath smile felt fake compared to Wook's. On another note, I loved the chemistry between Moonjo and Jungwoo where it felt like it could've been a BL. Like when he's calling him honey and all that. And i love all the annoying side characters that isn't like in your face annoying (except that one dude), but they're kind of subtle and throughout the series making the main character have this pent up anger and when he finally snaps at the end it's such a satisfying moment. I've also seen this in 'Extracurricular', where one of the main characters is supeeeer annoying but it makes it just so much better for some reason and gets me invested.

Okay but since it's only one season,, I have this theory of what a second season could look like. So if we imagine kind of that 'Flower of Evil' type of situation where Jong-Woo has to suppress his psychopath urges to function in society and stay low. And he again gets annoyed by the people in his workplace, etc and maybe he has a few incidents where he's aggressive or cold. And then Moonjo could come back to meet him and try to join forces, bringing out the psychopath in him again. And then some conflict with him and that police officer. Idk but i just think it was built perfectly up for a second season. Maybe even a third but not necessary. They could at least kept going for another season. Another sad thing is, this series have kind of an open ending/cliff hanger AND it's not on netflix anymore so it's hard to watch anywhere with good quality :( But i'm never forgetting this series and i hope i get to see Im Siwan and Lee Dong Wook being psychopaths in the future.