If you're confused, or comparing “Parasyte: The Grey” with the original, you should not. “Parasyte: The Grey”, as far as the hints they dropped in multiple episodes, is set in the same universe as the original Parasyte.

In other words, this is not your regular adaptation, it is a spin-off. It is called a “shared world”.

“Parasyte: The Grey” is set in Korea and tells the story of what happened when Parasytes landed in Korea. This is why there are a lot of differences, it is not an adaptation, it tells a parallel story. There are also similarities, and that can be easily explained as the world governments sharing information; as well as, humanity today thinks similarly, so we end up doing the same things even without direct contact.

Don't dismiss “Parasyte: The Grey” just because, otherwise, you're going to miss a greatly written live-action TV spin-off of the franchise. Again, based on the hints dropped in multiple episodes, this Korean spin-off exists in the same universe as the original material. It is, however, unclear if they directly based on the manga (the original), or the recent two-part Japanese movie adaptation.

If you're going to ask me, I think “Parasyte: The Grey” is closer to the two-part Japanese movie adaptation than the original manga and anime adaptation. But, that's not important. The important thing is, for the 3rd or 4th time, as per the hints, this series exists in the same universe as the Japanese story.

^_^

To be honest I wasn't expecting anything from this particular adaptation but I'm a fan of the manga so I was pretty intrigued regardless.

Time has shown us that adapting manga into live actions is overall a bad idea and can also be (this is too often the case) an insult to the original material and even to the fans.

Perhaps this is exactly the reason why "Parasyte : The Grey" is a breath of fresh air.
This live action is an adaptation but there is no Shinichi nor Migi here but Jeong Su-in and Heidi instead...

This is not intended to be an adaptation in live action of Kiseijuu this rather is a surprising live action adaptation that serves as a spinoff.
The story and characters are completely different but it still do in fact share the same premise and while it contains many similarities and references this adaptation is telling an original and new story.

So if you are generally afraid of adaptation in general (which is normal), in this particular case you shouldn't, the adaptation team did a very good job here, they made some strong and creative decisions to make the story more accessible while also exploring new and different themes but the core essence of the manga is well preserved and respected.

I was surprised by this adaptation it's an honest and humble proposition but it still manages to clearly demonstrate what both an adaptation and a spinoff should be.

Surprising.

8/10.

It being a "shared universe" had me going in a bit nitpicky on the details. If it were on its own, it would hardly matter but watching this with the concept of being connected to the original in mind, it's hard not to look at it closely hoping it doesn't contradict or devalue anything from the original. I'm surprised to say there's a shocking amount of consistency throughout in even minor details. For example, seeing the task force only form 4 months after the 'invasion' had me raising an eyebrow, but it quickly explained why they formed earlier there in Korea.
I still don't really know how to feel about the explanation for the protagonist's 'mutation' however. While it is a bit fresh (not even the spin-off manga tried that idea) it does feel a bit more superficial I guess? Fantasy-like? Consuming like half the brain and then moving over to the body a bit... I don't know, it just feels like it lacks the sense of cost that others have (having a body part other than the brain being consumed, being that you technically lost that body part in exchange for coexisting with that parasite). In comparison to other hybrid depictions, the circumstances here feel a bit too unrealistic, like a free superpower akin to Venom or something. But again, switching consciousness is an idea fresh for the series. So I have mixed feelings here.

Also this is probably because it's a drama, but the physical abilities of the parasites are definitely downgraded. Having normal humans dodge strikes from these creatures is completely contradictory to their ability. Their lightning fast speed is what made them such a convincingly huge threat to the human species, as practically any one-on-one encounter is literally hopeless for a normal human, being killed before they're even aware of it. But, for a series that focuses so much on human characters, having such overpowered creatures can definitely be difficult, not to mention making typical "on the edge" action scenes with them. So you're going to see a lot of missed strikes and just parasites slapping people around instead of going for the accurate insta-kill strikes like they're originally written. Like I said, I'm abnormally more nitpicky on this series because of its circumstances of being in the same universe, it probably doesn't matter that much but still it does bother me a bit.

There wasn't much discussion in the series as I'd like. Discussion about human values, philosophical ponders of survival, etc; all of it was really few and far between, forefronting the action plotline instead. I did like the little bit there was, and characterizing details like watching the certain parasites learn and develop in their own ways. But I really did want more from it in that regard, in the end most of it ended up being a cop thriller; sidelining character-driven storytelling.
The special effects weren't out of place at all, and looked impressive for how frequent they showed up. Actually, that's a big commendment right there- Lots of showcasing the parasites throughout the runtime of the series. Most television series try to sprinkle in the special effects scenes due to the budget, but this one definitely had enough to get the audience constantly familiar with these grotesque looking creatures.
The way it ended was cool in and of itself, but it does make you question where it will go with the series on it, if it does in fact get renewed for a second season. By large it was an entertaining little show. It wasn't all just action, it had lots of hints of a really good story and theme to go by, which is enough storytelling for those interested in the IP at least. Hopefully the second season goes for a less thriller movie-like approach and slows down a bit to be a bit more meaningful like the original manga.

Parayste:The Grey is a spin off of Japanese Manga series Parasyte.

Like most Korean series, this one is competently done. There's a balanced mix of sci-fi/horror/action off set by quality character development. As a consequence, this series has a depth and sense of realism, you don't always find, in series of this kind.

There's a nod to Invasion of the Body Snatchers, which is the most obvious point of comparison, with this series. Special effects are well done and further build the atmosphere of a normal world that's suddenly faces a familiar and at the same time, alien, other.

In summary, a worthwhile watch, if you like science fiction, action horror series.