On September 21, IU kicked off the encore of her HEREH World Tour concert for "The Winning" at Seoul World Cup Stadium. With one final performance set for September 22, this will mark the conclusion of her highly successful tour. 

Among those showing their support was none other than G-Dragon, who attended the concert and shared a backstage photo with IU. G-Dragon also included the 2017 song he featured on for IU titled "Palette." In that same year, IU performed as a guest at G-Dragon's solo concert.

Fans were thrilled to see these two veteran idols together.

SEE ALSO: G-Dragon to make first talk show appearance in 12 years on 'You Quiz on the Block'