ML SPOILERS

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Kara's ML is another nobleman named Bred. He's a vassal of the emperor who the emperor was trying to pair Charlotte with as part of a scheme to get her wealth. When the letter about the match came, Kara volunteered to go in Charlotte's stead to make him hate her for being 'crude and mannish', however Bred and Kara fall for each other immediately because they're both each other's type (he likes that she's not weak and delicate and they have the same tastes, like prefering beer to wine). They actually end up sleeping together immediately. Bred falls hard for Kara and even starts referring to Charlotte as his sister-in-law in her head. At one point he found out that the dad was plotting against Charlotte so he sent his knights to secretly follow her carriage to protect her, because he thought she was being led into a trap. Only for her to show up in front of HIS door, because she's there to yell at him about taking responsibility for her little sister because Kara is apparently pregnant XD. Bred immediately asks Charlotte's permission to marry Kara.

Charlotte's ML is the red haired duke (the emperor's half brother). He's the fire magician in the prologue and Charlotte is his lamp. They met because Charlotte bumped into him when she was spying on Kara's date with Bred. The duke falls for her immediately because her personality was so unique.