I really didn't expeted to like this series so much, since I had watched Discipline like 4 years ago and I didn't like It at all.
I mean, this time I really liked the plot. It was interwined and It included the them of immortality, a bit of crime, hacking, friendship and a really cute love Story with one of the characters from the first part, Ji Han, Just come back from France to Korea. Ji Han and Asin Story literaly made my heart flatter.
It is unusual that I get passionate about something in this way, and it's the first time that I get passionate about a korean series (parte from Color Rush maybe), since I dont like them at all. This time I found It really good.
I didn't like the vague ending, but I like tò imagine that Ji Han and Asin and Hyung Tae and Jay will have a Happy ending together. I liked their friendship group and I liked Ji Han and Ashin as a most of all. I really hope in a sequel, but I'm not fooling myself, I already know I won't get It, since this series Is 4 years old and we don't have any news.

I don't have lot to say, It was short but intense.
We see western actors speaking english and korean, and korean speaking english, because some parts are set in France (if I'm not wrong there are also parts in French).
In the last episode there Is a bit of violence and maybe too much paranormal that ruins the story a bit, but in the complex I found it amazing, don't ask me why.