@lollikpopchop@kchartsmaster I'm not a company stan, but SM actually HAS done this concept 10+ years ago. The first 3 groups I can thnk of who have done this style is: Girl's On Top, NCT, and ÆSPA. This HYBE song immediately gave me ÆSPA vibes.
@SqSehrish 1 (father) + 11 (sons) + 1 (sister/daughter) = 13.
There is a total of at least 13 people in the family according to this problem. It does not include a mother or any other relatives.