Psy called out�Yoon Gun about his judging skills.

Psy mentioned Yoon Gun in a tweet on October 20th that read, "Hyuuung~ how can you be so good at judging?! Kuku yes, it's true I am younger everyone ku."

For October 19th's airing of 'Super Star K4', Psy could not appear because of his overseas activities so Yoon Gun filled his vacant seat. This day, Yoon Gun showed excellent judging skills with his smooth, yet sharp comments.

He replied to Psy's tweet with, "Claim number 1 and hurry on back. Let's have some soju together. Psy fighting!"

On another note, Yeon Gyu Sung and Ahn Yeseul were eliminated from 'Super Star K4' and seven teams will be advancing into the third round.

Source & Image: TV Report via Nate