I'm someone who watches a lot action/thriller kdrama and movies but this one is one of the most disappointing I've ever seen. I get that the main lead is weak minded from the beginning and gullible but ugh. I will talk more about this in a bit as I want to go in order first.

One scene that not only pissed me off because it's just so ridiculous but is just so dumb. Context: it was night and the taxi driver is driving with the serial killer, he turned on his emergency light so that someone sees and possibly helps him as he already knows at this point that the guy in the taxi is a serial killer. (though at this point he doesn't know yet that the killer kidnapped his daughter, noir that she is dead already) and two guys follow them as they noticed the emergency light. They all park down near the street, it's only the two guys, the taxi driver and the serial killer - no one else is around, as mentioned it is dark and foggy. The taxi driver takes all his courage and jumps out of the taxi, runs to the two guys (who stand now outside the car) and asks them for help and he CLEARLY states that there is psychopath in the taxi who threatens him, he asks for help clearly terrified of the guy.

Now you would think that they quickly get into the car, lock the doors and call the police and drive away right? Common knowledge right?
NO. Not only do they keep standing literally outside the car the whole time, but one of the guys literally goes up to the taxi and knocks on the windows and DEMANDS THE SERIAL KILLER TO COME OUT??? it makes no sense at all?? What was he thinking?? "Oh yes a dangerous guy who might have a weapon hey let me go talk to him!" its so unrealistic and dumb.
At that point I thought that maybe they ran out of ideas and had to add it like this to keep the story ongoing without the taxi driver getting separated from him because maybe then the story would be just done right? Wrong. That wasn't the case because the taxi driver still escaped from him.

Now again; I understand that the taxi driver went through a lot and it was a traumatic event for him. But he is a grown man, how can he believe the psychopath so easily?? When he told him that he has his daughter and will kill her if he doesn't listen?? Literally you ask for proof?? I get he had her phone but he could have stolen it or even if he had her, why not ask for proof that she is alive?? Just a "put her on the phone so I can hear/talk to her then I will come to xyz address and drive you to mukpo"?? Alright maybe he was too scared in that moment to ask BUT until the very end he didn't ask not once for proof that his daughter is alive??? That's just unrealistic. Pisses me off.

Another thing I don't like about this was that the mother committed suicide. I get it was hard on her, I get it's hard loosing your child, but it was even harder for her husband who went and saw things he will never forget again? And on top of that she clearly has a son who needed her too?? It's not unrealistic, just incredible selfish and egoistic.

Another bad thing about this, towards the end the taxi driver was supposed to get his revenge but even that didn't feel good since the serial killer kidnapped chaeri and just... JUST ugh. It was so annoying, truly.

Whats maddening is also that his wife had the audicity to say "I won't ever forgive you" to the taxi driver despite that he didn't even hurt her not the slightest way. Yes I know she was scared for her life and stuff but he didn't even get a scratch on her and she heard all the traumatic things that he went through because of her husband yet she wasn't empathetic at all.

The only thing that would have put the serial killer into pain was clearly his wife with his baby dying. That didn't happen. Yes he got the death sentence and is in prison but someone who clearly doesn't feel pain, joy, sadness ect will not by affected by it. He kept laughing. Besides, It was stated in the drama that this psychopath is genetic in his family, so basically history will repeat itself once his son is old enough.

Talking about scared, he clearly mentioned he doesn't feel fear at all, that he is sooo fearless yet in the same context he is too scared to drive a car by himself because of that bus incident? It makes no sense once again.

I don't understand the good reviews on this, I know taste can differ a lot but I'm sure that people can't deny that many things in this don't make sense.