Why Is My Sister so Clingy!

Since my parents divorced, my personality has undergone earth-shaking changes. I have become cold and careless about external things. Even daily communication has become less and less. I don't care about things at home or at school. I am often regarded as weird by people in the class, but I don't care about anything about it. I didn't care, until that day, my father brought a woman, saying she was my new mother. Behind the woman, there was a girl who shrank, and poked her head out for a long time... With her appearance, my life has changed drastically... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.