Sunmi has unveiled a track list for her summer comeback single album. 

According to the track list below, Sunmi's comeback title track is called "Heart Burn", composed and written by Kyuwon 'Q' Kim and CobiCudi with Sunmi also participating in the lyrics. The single album also contains the track "Childhood", composed and written by Sunmi with Ash. 

The temperature is about to go up and up with Sunmi's anticipated comeback, coming up on June 29 at 6 PM KST