You're Taehyun little sister so he is really protective to you. You're a MOA (the name of their fandom), but he knows that he isn't your favorite member, it's (your bias). You came from (country) after living there for a long time in Korea and Taehyun took the opportunity to introduce you to the other members and it's since their debut in 2019 that he didn't saw you.

Taehyun enter in the practice room with you, where other members are.

Taehyun: "Hey guys ! She is my little sister !"