SMTown Concerts are a chance for SM Entertainment artists to get-together and have fun!
That being said, here's the adorable interaction between SNSD's SeoHyun, Sunny, f(x)'s Amber, and Super Junior-M's Henry~
"Henry: missed u all! #osaka #backstage"
"Henry: missed u! #amber #henber"
"Henry: ouch! .Amber #henber should we just call it official?"