(For the fanart: ctto)
The world had been divided into family names, each family represented an emotion or a type of personality. For example, the Park Family was happiness, Jeon Family was coldness, Jung Family was pride and toughness, Min Family was laziness and hardworking, Kim Family was weirdness and manliness.
Those are just examples, but these examples were giving by one leader of Family Institute. Everything was by force, either you like it or not. You have to follow your Family's emotion or personality.
There was one rule that no one liked, you should only like your Family and only your Family. That meant no mixing up with the Kim's or the Lee's or Nam's.
KIM IS KIM
LEE IS LEE
NAM IS NAM
You weren't supposed to even give any eye contact, except in the Family Institute Monthly Meeting. The day where Jungkook can face his former secret admirer, Park Jimin.