Spoilers!
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Novel reader here. These are terms unique to this world. The ML is a Golden Alpha - which means that he not only can control his pheromones at will, but he can also easily detect anyone who is Omega or Alpha, even if they are trying to hide it. But he is also an extremely rare type of Alpha called Ghost, that can gradually turn a Beta into an Omega through sex + knotting. Yes, there is knotting in this. The MC is also a very rare breed, a Diamond Dust, which means that he normally presents as Beta, but in the presence of a Ghost he releases pheromones that only the Ghost can detect. Plus by interacting with & sleeping with a Ghost he can gradually be turned into an Omega. He is also able to sense the Ghost's pheromones even when he is hiding them. He can also manipulate the Ghost with his pheromones, but he is not aware that he is doing it. Which is why it is so interesting to see them interact. Hope that helps!
You can make an account here https://www.novelupdates.com/series/diamond-dust/ (it's free, you need to be logged in in order to be able to click on the links).
There's 3 groups translating it:
- Novelib, https://novelib.com/story/diamond-dust/
- Borntonovel, https://borntobenovel.com/novel/diamond-dust
and Ocean Tales https://oceanstale.com/category/diamond-dust/
All use AI translations so pretty confusing sometimes. All fan made and not official so don't pay for any of them. They are at different points in the story. Novelib is a bit behind the manhwa, Borntonovel mid-story wise, and Ocean Tale has all of it. Very confusing as names & chapters do not always match either. I started at Novelib (it seems to have the best translation), then jumped to Borntonovel when the free chapters were done, then finished at Ocean Tales. Very confusing, I know...

Im on ch. 15 and wtf, everything is chef's kiss. But here's my two cents... I think yeon is a beta transforming into an omega? U know the thing enigma... Maybe, Kun's pheromones has a big impact for Yeon.
That's why on their first meet, Yeohyeon has grabbed Kun's attention because Kun (mabe and allegedly) thought of him as an omega. "Where are u wet, exactly?" That's why Kun asked this. Because he had thought that there's a possibility of Yeohyeon being an FFUCKING OMEGA