you are hyunjins sister but you and hyunjin have decided to keep it hidden from the public to not get the stays to be overhyped and there would be more risk that you would be kidnapped if people knew that you’re his sister, so everytime you go on a walk with hyunjin, you cover up so people cant identify you, and every time ppl ask if ur his sister, you just say that you are close friends, but stays are starting to think your not only friends