I've seen a lot of kdramas and this one feels like a ripoff of Signal (another Kdrama). It was ok but not unique. If you are new to kdramas, you will probably like it. I wasn't a fan of the characters/plot line. I know "bad decisions" are usually how drama plays out, but this one had the characters repeat some of the bad decisions over and over. The characters in this drama have apparently never watched time travel movies or action/spy movies either. Lol. The last 2.5 episodes finally seemed to get the plot back on track but I almost didn't make it past ep 6. (FYI acting was fine. It was the plot that was lacking.)