Responses
Spoiler
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It's her, her power changed her hair color, because her power sent her to his side, they will find out about this in the next 10-20 chapters or so
Another spoiler
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Her sister heard about this rumor (and the rumor that ML has a high sex drive when spending the night with FL) so she pretended to be his first love when the brother took the FL back to their kingdom (for a good reason) and seduced him. ML has already known about FL being his first love so sister just looked really stupid + FL got mad and confronted her
Bro they didn't mention about the blonde girl we saw in the ML's flashbacks like who's she!? Don't tell me she is the FL's sister and they will come suddenly to get married to him