Roy Kim reunited with Psy, his former judge on the audition show "Superstar K4."

He tweeted, "Bae Chul Soo, who made the final announcement to declare the winner of the show, and Psy, who worked tirelessly as one of the judges on the show, were all here at the radio show" along with a photo of them together.

In the photo are Psy, Roy Kim and Bae Chul Soo posing together with a big smile across their faces.

The whole world knows what a hot streak Psy has been on. Following in the footsteps of his former mentor and judge, Roy Kim is off to a hot start with his new release of "Spring Spring Spring" which jumped to the top of the charts upon its arrival. 

The song features retro-themed innocence and simplicity and has successfully appealed to people of all ages, transcending a multiple generations of fans.

Roy Kim will be performing as a special guest at Jason Mraz's concert on May 17.