This had such a great plot with so many details and turns that it was a thrilling ride all the way!
This was one of the first Kdramas I watched and it blew me away how great it was. Its refreshing how it can be dark without being cynical that the characters are passionate and always trying their best even though they are flawed.
Kim Hye Soo and Lee Je Hoon were amazing, I loved their dynamic as the story progresses.

This drama has stood the test of time and is still amazing. There are often whispers of a second season but I am so satisfied with the one season that I don't mind where there is one. The openish ending was perfect for me, as time doesn't end in a full stop it keeps going.

This is one of the best detective / SciFi / Thrillers I have ever seen