@Murim Lady
Spoiler!
If I am correct, it was because of his brother. He turned his mother against ML by playing several tricks. And ML knew nothing about those. 
Comment by Hebe 06 on Murim Lady
2 Replies
@Hebe 06 THAT SON OF A BI***
@Hebe 06
Spoiler!
It was WAY more that just tricks, brother was a real psycho and he takes drugs to stop himself from being violent
He would kill animals and put them in his mothers room, trash her room, and steal her jewlry, then he'd blame it on his brother, making her think ML was a demon child and brother was an angel who put flowers at her door(it was ML who did that)
She only realised when brother killed the duke and she pretended to be on his side stating she rember the sweet child who put put flowers at her window, and he said that he got them from the florist, but she knows they were wild flowers and they were at her door
He would kill animals and put them in his mothers room, trash her room, and steal her jewlry, then he'd blame it on his brother, making her think ML was a demon child and brother was an angel who put flowers at her door(it was ML who did that)
She only realised when brother killed the duke and she pretended to be on his side stating she rember the sweet child who put put flowers at her window, and he said that he got them from the florist, but she knows they were wild flowers and they were at her door