With their comeback just days away, Girl's Day�was the special guest on the March 25 installment of�JTBC's�'A Hyung I Know'.

During a segment, the girls serenaded Heechul,�who won first place, with choreography and the music to their upcoming single "I'll Be Yours."

The song sounds pretty awesome and the choreography is great too, check it out above!�Girl's Day's 5th mini album 'Everday_5'�will be released on March 27.