Who's male and who's female

i guess it's fine to say this now
male: hwa & seolhyun's younger brother
female: seolhyun

But the truth is
Male: hwa & seolhyun
Female: seolhyun's young brother

wait cause like this is going to be some spoilers. I'm uploading ch 78 in a minute so I think u better read it first before scrolling down but it's up to u.
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they made seolhyun believe that he's a male, that's why he thinks he is a male and his brother is a female, but in fact, seolhyun knows the truth.
seolhyun was adopted / lived with his younger brother cause they want seolhyun and his younger brother to be mates

Oooww, its like that. Thank you