Just One Day || a BTS Soulmate AU

Since debut Bangtan Sonyeondan have always thought that they were just a seven member soul group, and were happy to have the support of one another as they traversed the hate and mistreatment in the K-Pop world. Flash forward to 2022 after having taken over the world with their message and music, Seokjin is in the process of starting his mandatory military enlistment and has to register his soulmark with the Korean Government for the first time. To his utter shock, he finds out that they have an 8th out there somewhere, that she's had her mark registered since 2017, and has been waiting for them for a long time now.