Unknown Bts FF

A girl name Jung y/n with her brother Jung hoseok live in a small house because there
parents died when y/n 3 and J-hope was 7
so now y/n is 13 and j-hope is 17 and the other 6 live with them because they were lonely until y/n and j-hope came but little did they know that someone is coming for them to ???

will they survive?

IDK let's get into the story