You're the younger sister between Nam Soo-Hyun and Nam Koo-Hyun, only by 2 years.

The three of you live together in a small house, since your father passed away when you were still children.

Today, Soo-Hyun, his older brother, arrived home late from college. He went to the living room and found you sitting on the couch reading a book and Koo-Hyun listening to music on his headphones. Koo-Hyun looked at you and stood up, complaining: "Soo-Hyun, do I have to make dinner again??" — He looked at Soo-Hyun, who was placing his backpack on the couch next to you, Soo-Hyun nodded.