I love it when idols are clearly friends with their group members, but I love it even more when they're friends with other groups!
Here are a few of the closest cross-group friendships :3
VIXX's Ken & BTS' Jin
They're also both really close to Sandeul and they get jealous if anyone hangs out without the other one >.<
SHINee's Taemin & EXO's Kai
Being two of the most passionate dancers in SM, they were friends long before debut and are still super close!
Goo Hara & Seungri
They were actually friends waaay before debut, training at other schools together, and remain close to this day. They've never been romantically involved, just close friends!
JYJ's Junsu & SuJu's Eunhyuk
Friends since their school days, these two are inseparable. Even though Junsu split with SM, Eunhyuk still goes to see him and support him always!
SNSD's Tiffany & Sistar's Bora
While I'm sure they have ZERO downtime, the girls have actually said that whenever they have breaks they'll go hangout at each other's houses and just talk. They like a lot of the same things so they naturally because friends after being on a lot of variety shows together.
KARA's Nicole & SHINee's Key
Nicole once said that it was Key that inspired her to get into pilates which ended up seriously changing her life. They're still really close friends and are often seen partying together at music festivals or mutual friends' birthdays :D