I see a lot of Kimchay fics where Porsche and Chay grew appart and/or Chay has become jaded by the world and lost all of his cheerfullness and innocense and that's cool but i rise you this:
Chay grew up with a very good emotional support system so he becomes more guarded but still retains his innate kindness and his sunny disposition. His relationship with Porsche evolved but they have at least a weekly brother day where they eat takeout and play videogames, they're working on telling each other the most important things.
Porsche and Chay survived poverty, grief and hunger. Quoting the masterpiece that is Parasite (2020), money allows people to be kind, poverty makes them cold. A little mafia family is nothing, my boys survided debt collectors, one of them is a gen z kid, they'll be fine.
