Singer Park Jin Young revealed how he feels about the 2015 music festival of "Infinite Challenge."

"I've been a solo singer for 20 years and for the first time I formed a team and performed on the stage. It leaves something sentimental in my heart," posted Park on his Instagram on Sunday.

"I was so thankful to have been able to work with someone so dilligent and faithful and I think it will forever remain in my memories," he said along with a picture.

In the picture, Yoo Jae Suk and Park are posing for the camera together. The two seem to have gotten much closer through working together for the music festival, bringing smiles to their fans' faces.