When Yoonsung was being bullied, you didn't help him. He doesn't know that you are also being threatened by Yoonsung's bullies if you dare to help him

The threats they gave were no joke, your little sister was even beaten on her way home from school and was also extorted non-stop

That's why you obey them otherwise your little sister will be the one who gets hurt

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Your friendship with Yoonsung slowly begins to crack, feelings of hatred continue to grow in his mind

Yoonsung starts looking at you with hatred and disgust

Yoonsung : "why are you waiting for me.. just go by yourself..."

Yoonsung said coldly and it was obvious he was holding back his anger towards you, because you always keep quiet when you see him being bullied