Sunoo as your older brother. He's the oldest sibling, he's 3 years older than you. He's 20 years old and you're 17.

You have other younger siblings. William and Chaewon. William is 15 and Chaewon is 12.

You and your siblings fight alot in a playful way

You were sitting on the couch, until Sunoo came and pulled your hair in a playfully way