Last month, it was confirmed that IU and PSY would be making a joint guest appearance on SBSs Fantastic Duo 2.
The filming for the upcoming episode was filmed on May 16, which also happened to be IUs birthday. Many fans expressed their sadness at the fact that IU would be unable to properly celebrate her birthday; however, it seems like they dont have anything to worry about because PSY surprised the singer with a birthday cake on set!
In a new behind-the-scenes video from Fantastic Duo 2, viewers can see PSY entering during IUs performance of her latest title track Palette in order to surprise the singer with a birthday cake. The music changes in the middle of her performance, allowing everyone on set to sing happy birthday to IU, who appears to be very touched and surprised by the gesture.
Meanwhile, IUs fans also celebrated the singers birthday in a meaningful way by taking part in a mural painting community service project, which IU later visited.
Watch the adorably touching video below!