My same exact reaction. I don’t remember who is he
i think it was the war hero that dancing with the blondie in party. Our mc said they met earlier. the one with dark blue hair. that's why he doesn't have affection to the mc but to the blonde. (sorry i'm bad at remembering the names)
they met earlier than the novel(with the blonde)* hhe
adding onto Alicia’s comment, in the “original story” there was 3 ML candidates (the Blonde guy, the white-haired brother, and that guy who was also known as a Hero) FL hasn’t interacted with him at all tho
Wait, who's Killian?