Super Junior's member Heechul revealed a picture taken with BoA.

"The grumpy siblings, but both of us became adults now so we can't whine anymore," posted Heechul on his Instagram on Friday.

He continued, "It's something obvious but it's somehow sad, I don't want to mature. I don't want to act my age, the grumpy siblings, Heechul and BoA."

In the picture, Heechul and BoA are standing next to each other, making V-signs and smiling for the camera.