This is a scifi drama so you need to adjust your viewing lens to enjoy this.

Likes
1. Of course Namgoong Min
2. I thought the premise was interesting, i loved the reveals about the night of tragedy, the relationship between Jamie and Jung Woo, the reason for the lab.
3. I like the Jungwoo's team and my favorite is Old Man!
4. Ending was a little underwhelming though at least the baddies all got what they deserved. I preferred a different ending for Jung Woo but it's good enough.

Dislikes
1. Several plotholes, lots of unexplained history and facts since we don't have time to fully setup the characters and story so need to accept them as they are or else you will hate this drama. While watching I kept asking "why?" "how?" but I didn't let it spoil my mood - i just enjoyed the ride since I wanted to know the ending.
2. Only Jungwoo and Hyewon were interesting, Jamie's character could have been better considering she is one of the leads.

I don't have a lot of comments because I don't want to spoil the story. I think this is worth watching at least once esp for NGM fans or if you like scifi.

Rating: 8.5/10 (8 for the story + 0.5 because of NGM)