Comment by Monkey D. Goku on Swordmaster’s Youngest Son - Chapter 7

@Monkey D. Goku It's hard to tell this early. A rough guess might be that she thought he was safer without her. As a powerful potential contender who didn't want to be involved taking his side would have dragged her into the middle of it and potentially placed him in more danger. Merciless bullying aside, being weak and easily overlooked isn't exactly the worst position to be in during a blo*** family feud. The worst would be having enough power and influence to be seen as a threat but not enough to protect yourself. Having her as a sole protector would have elevated him from the first to the second.

@Mnemos Logos maybe
But I read all till the chapter that are currently there and there was no mention of helping MC even a little bit in previous life

Only one sister helped him which will be revealed in future and I liked her like she was good person then 1st sister for me

@Monkey D. Goku I like that future reavealed *nice sibling* better as well. However I still stand by my words. It was only a potential reasoning behind her behavior. The good, bad, logical or illogical parts of it have no bearing on my interpretation of her past life actions (or lack thereof in this case).

@Monkey D. Goku

This is my Theory it may not be true

Jin had the curse "Sword illusion" so he cant use a sword

so the siblings didn't think jin as a threat so Luna also didn't care