Former SM Entertainment group Fly to the Sky joined SM artists on stage at the 'SMTOWN Live World Tour IV' concert held in Seoul on August 15.
 

The duo were invited to perform and collaborated with their SMhoobaes including EXO's D.O and Super Junior's Ryeowook. In between performances,Brian and Hwanhee met up with the agency's chairman Lee Soo Man, and both expressed their thanks.

Hwanhee tweeted, "Thank you very much for inviting us to perform at the SMTOWN concert. Teacher Lee Soo Man, it was really moving and meaningful. I won't forget. To all the SM Family, I thank you and love you." Brian also posted, "Finally, back in Korea^^ And as soon as I arrived, there was a guest stage at the SMTOWN live concert. Even though I was tired, I had a great time~ SMTOWN FOREVER!! #FlytotheSky #Hwanhee #Brian #SMTOWN #SMTOWNSEOUL."

Fly to the Sky debuted under SM Entertainment in 1999 and parted ways with the company after their contract ended in 2004.