
The two sang a duet of Jo Young Nam’s own hit track, “Perianth Marketplace“, as the advertisement’s main theme song, only there was a slight change in the lyrics: “Come and check it out~ The place where customers come~ Application marketplace~ There is nothing that you can’t find~ T-Store.”
The CF was also created in celebration of the T-Store hitting 170 million in downloads.

IU even used her famous ‘three high notes’ in the song, showing off her impressive vocals once more under the support and direction of senior Jo Young Nam.
source: allkpop