A nice l story but too long

It's a nice story and the actors are great but the drama could be shorted. I went till the end and could not stop watching it but I had to accelerate some parts.
Interesting thing in watching old dramas is how much Korea has developed their skills on making dramas. Also is interesting watching how much technology has developed in 17 years by appreciating their ear phones, cell phones, cars, TV's...
Because of this, it's very interesting to watch old dramas.
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Amazing Thriller.

This Thriller let us speechless, hooked episode by episode. Amazing actor's. Excellent acting from all the characters. I couldn't stop watching until I finished. I don't understand how this didn't become famous, I had never heard of it. I'm glad it appeared as a suggestion on Netflix.
I highly recommend it to anyone who likes the Thriller with SciFi genre, you won't regret it. The main actor is simply amazing.
There's no romance involved but it wasn't missed at all.The story is very consistent