They forgot. Your teammates, your "best friends," had completely forgotten about your birthday. It wasn't because of the gifts, the cards, or anything. It was because you hadn't even gotten a "Happy Birthday" from any of them, and now you were sitting in the living room, alone, watching the movie they promised to watch with you. And you're alone, with the popcorn forgotten on the coffee table, curled up under a blanket on the couch, and trying your best not to be upset about it.
The credits start to roll, and you sigh, trying to muster the energy to turn off the TV, get ready, and go to bed. You've barely moved when the door opens, and Namjoon, Jin, Taehyung, J-Hope, Jimin, Jungkook, and Yoongi walk in, all smiling and smelling faintly of sweat. They spotted you alone, but of course, they didn't even realize what day it is. They begin to fill the remaining seats on the couch and armchairs, animatedly discussing the soccer game they were playing on the army field.
They forgot your birthday. And they went to play a stupid sports soccer game. You didn't know why it hurt so much. Just that it hurt, and your feelings were hurt. You were starting to realize that no matter how long you worked with them, how long you knew them, you would always be outside their small circle. A stranger visiting a unit that was more like family than anything else. They remembered each other's birthdays, celebrated milestones. And there you were... Begging them to do something as simple as watch a stupid movie with you.