Here is what written at the side
Super Junior Stayed Awake for 24 Hours to Walk Around Korea
On May 9th through the 10th, as part of the SBS's Hope TV 24, We Are One Family Special, six of thirteen members from Super Junior had finished their parts of the marathon.
Lee Teuk, Ye Sung, Eun Hyuk, Shin Dong, Sung Min, and Kang In carried yellow balloons across the streets of Seoul without any sleep for 24 hours to deliver "Hope" to all the families.
The 2 days broadcast ended with a closing show performed by including Brown Eyed Girls, SG Wannabe, SS501, and Moon Hee Jun..
credits: dramabeans
https://www.youtube.com/watch?v=cCLb114Gm_Y