
She sounds super jealous that the numbers aren't simping for her instead. Even more furious that, deep down, she knows 001 is WAY ahead of them in terms of skill but still had tendency to show mercy. I think that's what gets to her. With his skillset, he should have been ruthless and merciless yet he was kind and THAT'S what the numbers ended up respecting. Somehow, that logic doesn't connect.

There is no hate in my heart as red hot as I have for the emperor and that mage.
WHAT THE EFFING FUCK
SO....the knight was in love with 2nd sis all this time and was manipulated by a love drug for the supposed original MC sister and he ends up killing so many people for WHAT. OMG FOR WHAT.
AND THEY ARE DOING NO BETTER THIS TIME AROUND
ADULTS PLEASE. If y'all think baby girl is innocent and has no idea what is happening, SHE IS SLIPPIN INTO AN ABYSS OF DEPRESSION SO YOUNG COZ Y'ALL THINK SHE DOESN'T KNOW YOU'RE USING HER ONE WAY OR ANOTHER.
SORRY BUT I AM SEETHING

Sis is one of the most pathetic characters I've read. Understandably she was frustrated but to wish death on your sister just for the sheer fact that she refuses the sword is ridiculous. (I know other factors play here but it's the point the sis always comes back to). In the end , her sister wasn't wrong was she? The power CAN be wielded in other ways.
And what do you mean in the end she can attack too? Fuck...no shit! You just confessed to poisoning her.
Slight spoiler ahead.
I'm a bit pissed she redeems herself somehow just coz she really was slowly killing the red head and had NO guilt about it whatsoever. I wanted her to end up dead...oh well
There are times when character development is great. But, sometimes, we just want a different kind of ML, y'know?