They all loved each other like no one else would care for their siblings. They laughed, killed and fought all their problems together. How would they deal with a new member in the family when their only sister (Y/N) is uncomfortable around her.

Tae is a bored college student with too much energy, JK is an idol who wants a look at normal life -or to spy so he can see how his fans like his new album... With a deep scan on stan Instagram, they both come across something called "Kpop penpaling" where fans can connect through writing letters. Jeongguk goes undercover as a fan and DMs the first account he sees, Kim Taehyung. ✨Mostly a twitter crack fic ✨taekook ✨occasionally written chapters when they start to write to each other