She's not intentionally mean, but the cp is actually poisoning her with black magic
It wears off bc of the cup April sent her, so she appologizes and takes responsibility for her actions 
she actually gets re-engaged to the count bc she's move by his loyalty and is supposed to be quite handsome; she saw him as ugly bc of his thick glasses and messy hair
She's moved by his loyalty as kindness
He wants to marry the princess of salt bc he heard a prophecy htat the one who marrys's the salt princess will have their wish granted (or smth like that)
anyways, when he finds out April is also a princess he decideds to marry them both, Lamia as empress for her status and April as a concubine for her brain
Also the emperor is in a coma bc of cp black magic, and cp was experimenting on salts people
Salt bc a province of the empire ml lives in, and Lamia goes back to salt to help lead the people through the hard times
No news on whether or not ml becomes emperor after cp is imprisoned