f(x)'s Luna revealed she was heartbroken by a bad boy during filming for the upcoming episode of 'Juke Bus'.

Luna, VIXX' Ken, James, and L.A.U's Choi were preparing to sing a sad song when they opened up about heartbreak. The f(x) singer revealed, "I've had a very painful love before. I dated someone before, and he was a bad boy. At first, I didn't like him that much, but I fell more and more as time passed."

She continued, "However, he was the opposite and pushed me further and further away. I waited for his heart to come back, but I got tired of it and we broke up." Luna later added, "That's when I learned that painful love isn't really love."

This episode of 'Juke Bus' airs on February 26 at 11PM KST.