STORY: I was enthralled by it as soon as it started and was unable to stop watching until the last episode (didn't help that every episode basically ended on a cliffhanger). I feel like almost every plot twist was an actual twist that I didn't expect, which is pretty rare. The story just kept unraveling, and I was excited to go along with the ride. There are two plots that are working throughout the drama: the action side and the emotion side, and they're both done so well. (My only qualm was with the last episode that seemed a bit trope-y, but it was an acceptable ending in my opinion.)

ACTING: Everyone did such a phenomenal job. I could really feel the emotions each character portrayed. I really want to give props to Lee Joon Gi though since he was did so well, even down to what I would consider to be microexpressions (watch his mouth!)

MUSIC: I think the music heightened the experience while watching it by adding to the emotions and drama of each scene.

REWATCH: There are certain moments that I wonder if I can catch a hint of if I rewatch it, but even though I generally do not rewatch shows, this one was done so well that I think it'd be interesting to watch again.

OVERALL: After the first episode, I instantly started recommending it to everyone. It's totally worth a watch. It does cause a lot of stress though as you try to unravel the mysteries and hope that everything turns out alright by the end. But it's a good type of stress because it shows how good the drama is to invoke these feelings in the viewer. I also love how they really used that ~1.25 hours of each episode to the fullest.

WARNINGS: Just in case it wasn't obvious what you're getting into, just know that you will see people be murdered, be bullied, be kidnapped, and be stalked (and more). There's some disturbing aspects to this show, so be aware of that going in!