The drama has definitely surprised me by turning out rather average. It is not a bad one to be sure but it is not great, nor mind blowing nor even that intense. It is mainly quite mellow for a thriller and way too melodramatic. The plot is not original, full of inconsistances and uses the same old cliches like coma, amnesia, bad guy is actually an angel inside and so on. But more then that the script is poorly thought out, not enough attention given to details and too many times the scripwriter takes the easiest way to create conflicts and not even tries to give any sort of explanation. For example the story behind the serial murders happened in the past is very sketchy and for the most part ridiculously unbelieveble. Like the story about humantraffikers or a person kept in an asylum for 15 years without any purpose whatsoever except to serve as a poorly made plot twist. Or the MLs parents' motivation to conceal the truth about the ML is what exactly?

The leads are both missed opportunities. The ML is first shown cold and calculating and having problems with emoting. However it lasts for like 2-3 episodes and the other 13 episodes he spends being a big crybaby and getting beaten, tortured and framed by everyone. The FL, in theory the most conflicted charater of the drama, is actually the most bland one. She is defined only by her love for her husband and her unending cycles of trusting-not trusting him. Perhaps if more time and effort was put into her being thorn between her duty as a police officer and her feelings for the husband she would have been interesting. But alas she is a total letdown

The melodramatic part about the main couple's struggles is problematic for me as well. It is so syropy and forced. The beginning of their relationship shown in flashback gives weird vibes as the FL comes across a classic stalker who is forcing herself on the ML while he clearly and vehemently says he is not interested. She insists because (in her own words) she sees in his eyes that he loves her. Not very romantic really. Again it could have been a touching story if given more details and shown more subtly.

Now to the good part.
Lee Joon Gi 's acting is great (no surprise here).

Also I liked a lot the reporter friend of the ML. The most believable and realistic character. Sometimes weak and full of fear, sometimes brave, trying to do his best but still commiting mistakes and feeling guilt, passionate about his profession. And what a great portrayal by the actor, especially the way he shows love for the ML sister. So very sweet.

The serial killer is also great. Very scary indeed.
They should have made him appear earlier in the drama, because the evil doers in the first half are somewhat boring.

The little girl is adorable.

Nice OST. Sinister background music is especially good.

Rewatch value is zero for me