Hmmm dammmmn! It doesn't meet up very well, so perhaps they could be cousins that have bonded since Luke moved to Seoul? Woozi was in Daegu most of his childhood but he never got along with a majority of kids so once Luke moved with his family, he could have gone often to visit them perhaps? His family is pretty struggled to middle class as well so the common thread wold work for still being related I think! I can always toss us a custom to further discuss.