I read the novel so let me try explain cy backtory

I read the novel so let me try to explain it... So when they were still kids, they still love each other as siblings. Their father makes them to be always together in the same room with them clueless about the real reason. Then one night, chiyoung wakes up and found his siblings bathed in blood, he asked his father about it, he want his father to punish the culprit. The father just say its okay and then take chiyoung from there to be taken care alone instead, he only got a nanny to take care of him.

Then another night, when he wakes up he smells blood and realized it's his nanny's blood. When he asked the nanny, she just say he doesn't need to worry about it. Another day, lil chiyoung got friends (that blonde and his brother), ofc chiyoung feels happy to get friends. But just like before, one night he wakes up and found them in blood, and that night is the day when he finally realize the truth. He is the one who hurt his siblings, his nanny, his friends when he unconscious. His father actually know but he didn't do anything, instead he deliberately send someone to lil chiyoung, to see if chiyoung still can 'take care' of them.

So basically, his father want chiyoung to grow up to be the perfect overseer. Why he unconsciously hurt someone is because he have high territorial sense(?), that is perfect to become overseer.

And then when he finally free from that lonely training, he heard his sister birthday coming up. So he went there, thinking that he finally can see his family that he loves. But when he arrived, what he got is unwelcome stare, even his sister who loved him, now looking at him like he is a monster. So then he realizes he doesn't have anyone, not welcomed anywhere.