I went into this drama with all the hype surrounding it, expecting a mixture of keep-you-on-the-edge-of-your-seat, twists galore a la 38 Task Force and a bit of the grimness/sadness in the character interactions as you would imagine from a drama whose premise is based on time paradoxes. A word of caution, I found it to be slightly overhyped, and some plot points predictable. Around midway through the drama, when they were solving a case, not central to the main plot, I felt like things were dragging a bit. Why then did I continue to watch this? Of course because things picked up immediately after that especially with the "Hongwon-dong case", enough for it to be nail biting until the end. But it is also true that such dramas don't tend to have much re-watch value for me since the suspense factor is gone once you have watched it completely. Having said that, this was not your usual crime procedural, nor was it like your typical time travel/time paradox drama. This was different, in its plot and execution. It made me think more than usual about time paradoxes, and more than anything, how, you would/could probably never change some decisions, even if you knew, what the consequences would be. The central characters all left a lasting impression. Coincidentally, this was also the very first time I was watching Lee Je Hoon and Jo Jin Woong on screen, and both of them made me sit up and take notice of their acting. Throw in Kim Hye Soo, and this was definitely a seasoned cast at play, I would say! There were no trailing plot threads either and everything was tied up well together till the end. In that, I think Signal has won (hats off to the director, writer and cast). Finally, the message I take away from this drama is that "If you don't give up, you can always change your future for the better", and I will probably be reminded of this whenever I face obstacles in my own life :) Also if ever there was a second season, I think I would not want to give it a pass!