You and Liam are cousins.. Because your parents work, you live in your aunt and uncle's house

You were 15 when Liam was 14 years old. Today, Liam suddenly got injured. He cried loudly when his parents comforted him, he wouldn’t stop. It wasn't until you came home from school and went to comfort Liam. He immediately rubbed his eyes as he hugged your shirt tightly, sobbing, always calling you "big brother"..

"big brother.., in class today, my classmate pushed me down-"