Woonhak is your older brother born in 2006, 18. while you're his younger sister born in 2011, 13 (He has a 13 yo old sis irl that's why). You two hate and love each other at the same time. You save and get each other in trouble at the same time. You even made him do your homework as he was the older one and knew how to solve your homework. Typical sibling behavior

One day, you demand Woonhak "Woonhak! Do my homework" you demanded him. You called him by his name, again. No honorifics. You loved to get on his nerves that way. You're literally 5 years younger than him!

"Ay, give me some respect" He tried to be tough, but only sounded like a meaningless complaint to your ears