Is just my imagination, or are there hints of superpowers in this? I saw lots of clues:
1. In one of Mr Greywood's lines on the bus, he cuts himself off as he's saying what could only be the word "abilities", when talking about secrets he kept from his partner.
2. Larissa (I think I got that right) is treated very strangely by the military squad as if she's only tolerated because she's useful. She also mysteriously fixes the MC's shoulder with a "massage" that looked more like she was just holding it, and then gets chewed out later by the general for doing it.
3. The military group's talk about "one of us" when it seems from context they're not just talking about the the military group itself.
4. The Chameleon squad...
What was the movie... The Host, a 2013 film...coincidence?...

Now, this story could absolutely be based on or a twist of that plot (or not), with some other elements blended in from other movie, book plots... The "crown virus", the eye color changes are successful hosts... Unsuccessful die, or go mad... Or, there's more than one "faction" or "race" of aliens, one benevolent (like Wanderer in The Host) and one not so benevolent. Then, there's surviving human "non-hosts" caught in the middle of it all... Or maybe the virus affects the aliens... Idk, so many ways this could go...
1. Yeah, Greywood is "one of them", whoever "them" are...
2. Larissa is one of them, too. And I'm guessing she almost gave "them" away healing the MC so fast. She's the one that really makes me think "aliens"; she says the MC made her feel, human...
3. The military group is "one of them". Them who is the question... I have a hunch, of course, given that this is starting to feel similar in some way to the movie The Host... The military group could be a group that is trying to defend itself and some humans (for some reason), from a not so benevolent "invader" or result of the "virus"... But that idea really makes me question the plot... Why send all of them home, without making contact 1st to make sure it's safe...

idk...
4. They can blend in, become whoever needed. Their appearance is hidden because I'm guessing they aren't, or don't look, "human", yet...
Just my wild speculation, though...

I'd suggest not thinking about it too much, because only the dev knows where this is going right now...