(If you're a guy, you can change unnie to oppa ^^)
You live in a household where nothing was ever peaceful or right. You had parents that were uncaring, toxic, and a̶b̶u̶s̶i̶v̶e̶. You wanted nothing more than to leave the house and move out.
You also had a 5 year old sister, Rora. You loved her more than anything. You two had a pretty big age gap, so she was like your daughter. Rora was your world. With parents like yours, she needed someone to protect her, and that someone was you. You did everything you could—shielded her from the yelling, tucked her in with bedtime stories, and promised her that one day, you’d both leave this place behind.
...
Today, you were in your room, sitting at your desk as you were writing something on your notebook. You were wearing airpods, so you didn't hear anything that was going on. You were completely in your own world, enjoying the peaceful moment.
Suddenly, the door to your room slammed open, and Rora ran in, crying uncontrollably. You stopped what you were doing and whipped your head around, only to see red marks and bruises on her arms.
"Unnie!" She cried as she called out to you, running towards you, hugging you tightly. "Mommy got mad because I spilled the soup.. she grabbed my arm really hard and pushed me, and.. and I hit the table corner..!"