
it rlly depends on the author. ESPECIALLY fargo, cause fargo HAS changed omegaverse concepts in her own works before. like, instead of bite marks being how couples bond in her omegaverse, they undergo a psychological connection. so i don't know if she would approach the enigma concept in the same way. or if she's gonna go through with that at all.
i'm not as informed on it, but from what i've seen so far, theyre most commonly portrayed as a gender above alphas. it means exactly what it is called: a complex and more difficult to comprehend existence. i'm pretty sure their main unique trait is that they can dominate alphas and even get them pregnant lol (but we don't gotta worry about that in this shounen ai story).
siwoo is an alpha himself, but he reacts quite differently to byul's alpha pheromones compared to how other alphas should react. like byul's pheromones rn are supposed to irritate other alphas, especially since he's mad, but instead of being disgusted by them, siwoo looks like he quite likes his scent no matter how soured it is from byul's anger.
like, unless he's an omega there's no reason for him to be physically attracted to byul's pheromones. but fargo has made it clear that this is α/α so idk what else can explain it other than siwoo being an enigma... or it's just that maybe he's been in love with byul since their childhood and just grew to like his scent?? or maybe alphas can just be attracted to other alpha's pheromones idk anymore
it'd be nice to see the enigma trope more often in mangas/manhwas tho ><

fargo advertised it as such on her twitter!!
heres the link: https://x.com/13_fargo/status/1861079561305465256
and yea, the obscurity around siwoo's gender is also another reason i'm thinking he might be an enigma. his gender has never been properly introduced.
wait so is siwoo an enigma or... idek if fargo digs into tropes like that but this is α/α and it's not like fargo is gonna reuse the storyline that was used for dojin and hyesung
(please don't, fargo...)