Finally I finished watching this drama after like 2 years procrastinating. I started watching the Japanese adaptation first before watching the original. Since the Japanese remake tend to be shorter in length than the Korean one, the pace for the former tend to be faster and some parts from the original may not be included in the remake. While at first, the slow speed at how the plot on the original may feel a bit draggy when compared to the remake, the plot later gradually pick up and revealed to be as engaging as the remake.

Having watched the remake first, I couldn't help noticing that some of the scenes was a bit more cleaned up in the remake. Regardless, it didn't mean the the original production wasn’t as good. Loved the casting, and Jo jinwong and Lee Jehoon made a very good pair for partners separated by 20 years between them. It was an unlikely partnership yet you can tell that they really can work together well as a team despite the barrier between them.

At first, I wasn't really taken to Jehoon as Park Haeyoung. Probably because he was in a period drama prior to Signal, the accent that he used to speak in the drama seemed jarring to me. But gradually that awkwardness in the way he spoke throughout the drama started to fade away and I was able to continue watching his scenes comfortably. Jehoon's acting started to grow on me due to his more recent works so it was really interesting to see his older works and him taking a role of a soft-spoken profiler. That aside, I was much more familiar with Jo Jinwoong's works so it was pretty enjoyable watching him play a righteous detective who tried his best to solve crimes.

Overall, I like how the entire plot had been written. Considering a lot of the cases shown in the drama was based on actual cold cases that happened in South Korea, it was an interesting story on how things like a transmission from the future may affect the outcomes of the past and change the future.