Jung Hyung Don's "Gangbuk Fancy Guy" that was released on January 5 has been at number 1 on music charts for 5 days in a row.

It is ranked number 1 on various music sites such as Melon, Mnet and more. This song was produced and released for an episode on the show, "Infinity Challenge."

This song was also produced and written by fellow member Park Myung Soo.

There was also a bit of a crisis in that was the quality of the song as great as the issue it was receiving.