"... and that's what's going on."
Queen Lee and Jisung had left once Felix had calmed down, to go and give Hyunjin and the King an update on Felix's state. The moment the royals were gone, however, Jeongin promptly launched himself into an explanation, having somehow figured out that Felix genuinely had no clue of what was going on. He explained betas, alphas, and omegas, along with things such as presentation, scents, and instincts. It was all a bit complicated, but Felix was clear-minded enough to understand that this was a biological rule not even he could avoid, even if he was from another timeline.
"To be frank, subgenders are beginning to lose prestige," admitted Jeongin. "More and more people are beginning to present as betas, and they aren't as in touch with their instincts. Seungmin has theorized that, in the distant future, subgenders will have become completely obsolete and, as such, the genes will simply become dormant."
It made sense. There was no such thing as subgenders in modern times, but the genes falling dormant would explain it. Many historical documents were badly translated or lost to time as well, so it could be that any trace of subgenders in History had simply been lost or erased, hence why he didn't know anything about it. And, if the genes were dormant rather than dead, it would explain why Felix had now presented, to a certain degree.
"Though subgenders may have become obsolete in your time, it is still heavily present in ours. I believe your biology might have simply reacted and forced you through a delayed presentation in order to better your chances of survival in this period," continued Jeongin, offering him an awkward smile.
Felix nodded in agreement, feeling strangely... resigned. Now that the initial panic and confusion had ebbed away, he just felt tired. It felt as though this era was trying to suck him in, making it even more difficult to return to his own time, and he was just too exhausted to fight it any longer. So what if his body had suddenly modified itself? He'd dealt with the shock of time travel, he could deal with this, too.
"You won't be able to carry children, but your body and your instincts will still try and make it happen, through bi-annual periods we call 'heat'," then explained Jeongin. "It's meant to be an omega's most fertile time but, for you, it'll simply mean a craving for proximity, attention, and intimacy that'll last for about a week. You will also become much more sensitive, and mood swings are to be expected."
It certainly didn't sound all that fun, but he supposed he'd have panicked more if he was suddenly told that he could carry children – that would have been an entirely different pill to swallow. Still, he wanted to know everything about his new... condition, even the less pleasant stuff. He gestured for Jeongin to go on, and the healer thought it over.
"Well... You have a distinct scent, now. Betas don't usually have one, hence why we assumed it to be your subgender before. Now, though, you have a very sweet smell akin to sugar – alphas also have a distinct scent, akin to spices. As such, everyone will immediately be able to tell you are an omega."
Felix grimaced, then pointed at his jade seal that marked him as Hyunjin's personal guard, which was carefully placed on a pile of folded clothes. Jeongin's grimace when he understood the question didn't go unnoticed.
"... there's never been a guard omega before," he then admitted. "Omegas in general aren't allowed to hold many jobs, but male omegas... They are extremely rare and are usually hidden away by their family or their partner – a treasure cherished behind closed doors."
Felix narrowed his eyes upon hearing that. Just because he'd just presented as an omega didn't make him any more fragile or more likely to get hurt in a fight – he was still the same person, with the same abilities and the same spirit: he absolutely refused to spend his days hiding, of all things.

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How To Avoid Doom Flags? : A Guide By Lee Felix
FanfictionLee Felix is just your average guy enjoying a sabbatical trip to South Korea - that is, until he abruptly finds himself thrust in the midsts of the Joseon Era. And yet, accidental time travel quickly becomes the least of his worries when politics, a...