Mnet’s popular audition program Superstar K is back for a fourth season, and contestants from seasons past turned up to join in on the festivities at the show’s opening ceremony on August 17.

The contestants from the previous seasons took to the stage for special performances, and among the lineup was Two Months and Jang Jae In, who were joined by Cho Mun Geun for an acoustic cover of SISTAR’s summer hit Loving You.

Check out the performance below.