Jakehoon: porn star sunghoon and innocent photograph major Jake.
Jayke: assassin Jake on a job only to be caught by ceo jay who is Jakes target who Jake realises is his first ever friend.
Jakewon: Jungwon the little devil who takes advantage of the fact Jake is such a kind hyung. (Starts from Jungwon trying to help with his mouth sores)
Heejake: Jake who's invited by sunoo to some only get on mafia leader heeseung who wants to put him in his place.
Yunki or sunjake- I'm not sure if I'm comfortable writing Niki and Jake smut yet because he just turned 18 plus I really don't know how everyone else would feel. But like college jake who gets coxed into joining cheer and if it's sunoo he's the cheer caption and if Niki he's the quarterback with an obsession with jake.