Korean version is amazing. I have watched it over and over again and still like it until now.
So, when i see the Thailand remake of this drama. Of course I will watch it, and comparing it with original series from each episode.

There are some elements that are not as strong as original version.
- thriller element : they have same story. but i dont think I get thrilled by this drama. even when I re-watch the original version, I still feel the same sensation. but I dont get it from this drama. I remember in the original version, how the killer chasing and killing the victim. when main character feel worried each other. when they fight each other. its really good. but in this version it just something happen. its a moment with no energy and nothing special.
- shock element : this is an important element in drama especially thriller drama. there are some twist and secret. In korean version, they really handle it properly. but this version, it just like "wow, that's a secret. okay I must show that I am shocked." there are many quotes that I think important don't included in this drama.
- action element : In korean drama, I feel how strong both of main characters are. they really good at fighting, they really good at investigating. and park kwang ho is really someone who has a quick response. In this drama, they are not as strong as original version. so they often asking question from other and get helped by another person.

There are some elements that are good.
- warm situation : main character in this drama is not really hate each other. In original version, they really suspicious each so they ended up situation where one of them thinking the other one is really bad. In this version, even if they still debate and fight, they don't think that the other one is bad, but there is a reason behind their action.
- comedy : when the original version has serious tone. in this version sometimes you find some comedy. that's what thailand drama that I know. they can give comedy for every genre including horror and thriller.

in my opinion, i still like the korean version more. I have re-watch the korean version many-times. And I dont get bored at all. I can finish it in one or two days. in thailand version, I need more days to finish it, because i get bored in the middle episode even this is my first time to watch it. but overall, it's not that bad, you can try it.