I will start off by saying that I haven't watched the original version of this drama (Korean, 2014), so I won't be able to compare the two versions. First of all, there is a lot of violence in it, so I don't recommend watching it if you feel uncomfortable to see blood and violence.

"Bad Guys" tells the story of a group of criminals that work together with a police officer in order to catch other criminals. Reason behind that is the murder of the son of one police officer. The story develops fast in the beginning but manages to slow down to tell an interesting story. Every main character has their own backstory which is told throughout the whole series without losing track of the original idea.

The acting is good, though I wouldn't say it was great. The characters are believable most of the time but especially villains seem to be acted "over the top" (they are still good villains).

The OST is good most of the time but the soundtrack seems a bit off sometimes. That's a personal preference, a lot of people enjoy the OST a lot.

In the end, "Bad Guys" is a good thriller with interesting, good characters and story. Though, it has some flaws, it is worth to try out.