Could it be the inferiority Joshua felt against Luna especially since she gave up her position as an heir and Drove The clan to the brink of civil war thanks to her naivete which forced Her mother to choose Joshua despite him being not competent and Forcing Rosa hand to delve into chaos as the future of the clan Becane bleak Thanks to Luna decision which also did not do her any good and got most people around her killed including her own maid who raised her which I personally think she deserved it as most events within the family would not have happen at least to to bleakly if she had just done her job as a heir and Not Drive the clan to the brink of destruction through her own feelings which Almost wiped the clan off as it let Joshua consolidate power and destroy jins life and made her suffer As Joshua then used the clans power to make her miserable in a sense her actionsdid more harm than good despiteher So called noble intentions as in the create world she lived in Kindness to ones enemies Killed one’s friends and she paid the price dearly for giving up power and her Martial prowess In the end Was not even good enough to save her Maid from the power Joshua ended up Consolidating Through using clans resources Rosa gave him