This show was so well done and I'm glad that I finally took the time to watch it. My brain feels somewhat fried, trying to keep up with the twists and turns in the story line, and attempting to keep the past and the present sorted out. I'll admit that time travel, butterfly effect shows are hard for me to grasp. Since this show is from 2016, the whole thing is kind of grainy in its film quality, both in the present and in the past, so it was sometimes hard for me to figure out which time period I was watching. A lot of the characters looked pretty much the same in both time periods, which you wouldn't expect from a 20-year time difference.

Corruption, unfortunately, was a big part of the drama, and that seemed to be the cause of so many unsolved cases. That got a little old. Plus, working under people that you know are corrupt was very hard to watch, their efforts were stymied more often than not.

The acting was excellent, most notably Jo Jin Woong as Jae Han and Lee Je Hoon as Hae Young. Especially impressive was the fact that so much of the time they were acting alone, with just the walkie talkie, and not face to face with other actors. I felt a whole gamut of emotions watching this, excitement, fear, sadness, and hope.