This drama is an interesting examination into the question: "What if a drama was created purely for the purpose of trolling its audience?" Let me just say, regardless of my general distaste for it (more on that later), I'm actually grateful it exists and was attempted. Do I think it was a successful attempt? ....Uhhh no. But there's enough brilliance in here that I think if someone was to know what they were getting into and had ZERO expectations (also if they were a forgiving drama-watcher), they *might* like the journey. It starts off with EXTREMELY stereotypical characters that have no real depth to them, plus there's so many people in the cast that at times its a bit discombobulating. But probably its greatest strength is evolving these stereotypical characters into really well-rounded and likable characters--especially the leads. Their group connection as the drama progressed really rang true. The female lead is such a strong character throughout and it was brought to life brilliantly by Baek Jin Hee, her dynamic with Jung Kyung Ho's character felt EARNED and was a wonderful portrayal of pure friendship. Jung Kyung Ho in particular really impressed me; his insistence on seeing the best in people, his dedication to the group, and just how he executed this character was great. He also had some really great moments with Oh Jung Se's character. I loved how their connection/friendship manifested in some extremely funny and laugh out loud moments throughout the drama's entire run. I actually REALLY loved the comedy and parody on drama cliches that were sprinkled in throughout this drama (aka the slight trolling). I honestly wish it focused MORE on that because that's when this drama went to really interesting, human, and heart-felt moments oddly enough. When it wasn't taking itself so seriously, those were the moments where I sat up and thought, "Huh, that was actually quite clever." Unfortunately, most of the time it focused on REALLY serious and scary stuff with the approach of absolutely NO logic whatsoever--it's biggest (and fatal) flaw. It felt like you were CONSTANTLY waiting for the shoe to drop on these characters with really predictable outcomes. I would have been fine with no logic if it was interesting and also unpredictable throughout, but it wasn't. You could easily tell when something was going to go the survivors way and when it wasn't--I also saw all the twists that happened about a mile away. It was never surprising, but ALWAYS frustrating. Frustrating in that they kept siding with and forcing these characters to be around a character that was an absolutely TERRIBLE and UNFORGIVABLE human being. I give MAJOR props to Choi Tae Joon; he really shined as the villain in this drama in a role I'm never-ever going to forget. But it's MADDENING how his character was handled and I completely understand the people that down-rated this to a 1 or 2 for simply that reason. I understand that the drama was trying to play off the bond between Tae Ho and Joon Oh's characters, but it crossed too many lines to be believable. Delving into details would go into spoiler territory, but I'll just say that the ending is a pure WTF moment. I legitimately thought for about 15 seconds that the characters were all in a psych ward and that the entire drama that came before it was just their made-up 'story.' O_O ....THAT would have been brilliant and understandable. ....Unfortunately, that's not how it ended. This is truly and honestly the weirdest kdrama I've ever watched. I ended up rating it higher than I thought I would (I gave it a 5.5 rating), but unfortunately its uniqueness and great leads couldn't save the script from the individual(s) responsible for......this. o_O