Jungwon, is your younger brother. he is very naughty, and also ignorant to you. you are only two years different from him. One day, when the school held an event, and you were one of the people who organized the event, you saw your younger brother, Jungwon, about to perform a song using his guitar.

"noona!" He calls you. Noona is his special nickname for you. He was nervous, and grins mischievously to you, for hide it. "When I perform, scream as loud as possible, okay?"

[Noona : is a term for older sister, for younger brothers to call older sister in Korean]