First of all, it does NOT deserve the scathing reviews or low rating it is getting simply because it's a remake which I think was stated in the show's description? So I have no idea why people are mad as if they have been deceived. I LOVE the original show. The first 2 seasons were one of the best TV experiences I ever had. After it ended last year I was quite nostalgic so I feel like if you are someone like me then I don't think you would mind much. But if you are looking for something original and brand new then this is not for you.
Having said that I also understand there are legit issues raised by some people regarding aspects of the show that the korean version could have made better but chose not to.
PLOT: follows the original plot with minor deviations here and there in terms of a certain scene or a character's backstory. The story length was not adequate in my opinion and the cliffhanger was unsatisfying. I know their intention was to drag the story in part 2 but it did not feel like an adequate ending for part 1 either. The 6-episode length has made the story rushed with not enough character developments. Although the professor- syj and denver- misun (og monica) couple had chemistry it did not feel natural. There are some cringey scenes which feels forced and quite uncharacteristic given the context.
ACTING: Actors for Berlin, denver, moscow, misun, youngmin were perfect. SYJ and professor's acting is also impressive but severely disappointed in nairobi and tokyo's casting choices. Tokyo and nairobi's characters needed someone who is impressionable as they are very impressionable themselves in the group. I hardly barely felt that from them.

..,and I guess that's the problem of remaking such impressionable characters and a show that became a global phenomenon. It's impossible not to be compared and not compromise quality due to burden and pressure. Despite that, it did okay but nothing special.