Okay, as someone who doesn't really enjoy Sci-fi genre I actually enjoyed this quite a lot, but it might've been the cult elements. The acting was fantastic from every single character, I can't name one character who stuck out due to poor acting skills and that isn't common to me in dramas. On top of that not a single character left me frustrated at all, I could understand every single one and the actions they chose although Jihyo had me going ???? HUH sometimes due to how dumb of choices she made. Sehee at first slightly bothered me because it seemed like she was trying to sabotage Jihyo but by the end she seemed to prove herself as a friend. I think this could've easily been a gl and it probably would have in another country, like the beginning Bora saying they dated, them moving in together, easily could've been a gl. Only one thing bothered me in this entire drama, it was the ending, it was so blah when the rest of it was quite good. This drama had quite a few familiar faces but they portrayed themselves totally differently. If you want to watch just on it saying the genre is thriller, I wouldn't. There are no aspects of a thriller at all other than if you get a bit scared the lead will get caught doing something, but that's all. Anyways I would definitely recommend this to anyone that likes dramas with cult themes. If you don't like the first three episodes I wouldn't recommend watching anymore.