Spoiler!
@mimi so basically if i remember correctly he hit his head or got into some accident when he was young and it did something to his way of thinking as in made him "less smart" so he was constantly getting compaired to his sister whos a genius by his father but his father had told both his kids or at least hinted to them theat they werent his favourite so basically it made this hostile environment entirely and the siblings just hated eachothers guts coz they both thought the other was getting special treatment and for yoha. That made him feel extremely inferior and he started taking it out on mc who sort of had everything except he also did like the mc at the same time so hed keep regretting treating him poorly
Now this could be extremely inaccurate i read this ages ago this is just what i remmeber
Novel is complete btw i can send u the source
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