This story is purely based on my imagination. In any other means, it's not to hurt anyone's feelings. BTS characters are taken, but I don't have any right on them.
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Jungkook & Seokjin were blessed with twins 13 years ago, Jimin & Taehyung. But one of the kid got a an illness when he 10 which made both of their parents to concentrate of their ill son.
They were so engrossed in taking care of their own child that they forgot that they had another.
This is the story of Jeon Taehyung, who tried to get his parents attention for years but finally lost his hope after that incident.
Is it too late for Jungkook and Seokjin to realize their mistake ?