
I didn't read the side stories but I can give u a couple bad things the black haired brother did from the novel but not all the context so it doesn't spoil it too much
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- He accused Penelope of trying to kill the crown prince when she was innocent
- He assumed that buying her gifts instead of apologizing to her would make her forgive him/fall in love with him (yes he was in love with her but still treated her shitty)
- He ruined her birthday/coming of age ceremony even though the dad and other brother tried so hard to make sure it was special for her
Those are just a couple things he did off the top of my head
See the older brother needs to die like right now fucking asshole