I watched this drama because a lot of people keep saying that this is really good. I am usually watching a lot of thriller&mystery drama so i had high expectation regarding this. Sadly i was a little disappointed. The story was good but could be a better development of cases and characters. This drama has some original parts that until now i didn't found in another dramas so let's say it worthy to watch. For those who are not a fan of thriller&mistery drama, Signal, can be amazing and catch your atention.