Singer Gummy held a successful duet concert with Wheesung.

On January 1, Gummy's agency stated, "Gummy held a duet concert with Wheesung on December 31 at the Coex D Hall and met with 6,000 fans. They performed songs that were not released and also had contestants from the 'Hidden Singer' show from the Wheesung episode come on stage and perform together as well."

They sang many of their hit songs and Gummy performed many of her popular OST songs and had fans excited as they reminisced the dramas.

This concert sold out of tickets as soon as they went on sale and showed off their amazing ticket power.