You're Woonhak's little sister. When Woonhak left to fulfill his idol career, you were still little and too young to understand that you weren't gonna see him for a while. Soon after, you understood that you'll mostly see him on tv.
Recently, both your parents had to go somewhere for the day, leaving you needing a babysitter. Your parents did NOT trust you with a random babysitter, considering your last one literally LEFT mid day. Maybe you had something to do with it.
You suggested Woonhak to babysit you and wouldn't shut up about it until they finally agreed. With the permission of Woonhak (and HYBE), you were allowed to be there for ONE DAY. (maybe even more..?)
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The day came and your parents were on their way to drop you off, before going to whatever they had to do.
You got to the building and saw Woonhak standing there, obviously waiting for you. When he saw you in your (guys) mom's arms, he immediately softened and let out a grin.
She handed you into Woonhaks arms, along with a backpack full of all your stuff. She was explaining everything he needed to know. He knew most of the stuff, until he heard about your new habit of disappearing.
Hearing that worried him a little. What if another idol runs into someone who looks no older than 8?? That'd be confusing for both them and you.
She bided both you and Woonhak goodbye, scolding you playfully, before leaving going back to the car and leaving. Woonhak looked down at you with that same grin before walking into the building to go to the dorms.