A K-pop boy band helped celebrate an important milestone for one of South Korea's most popular TV programs. 

The members of NU'EST appeared at a special event celebrating ten years of Infinite Challenge.

On Jan. 13, 14, 16 and again on Jan. 18, the five-member K-pop boy band performed for audience members at the Infinite Challenge Expo, a special anniversary celebration for the critically acclaimed comedy program.

Most recently, Infinite Challenge took home four MBC Entertainment Awards including the People's Choice Award for Best Entertainment Program.

Active since 2012, NU'EST have spent recent months promoting in Japan. The group dropped their first Japanese-language studio album, Bridge the World, in November 2015.

Meanwhile, NU'EST's Aron revealed that the group is working on a new Korean album. The title of the album has yet to be announced.

NU'EST is signed with Pledis Entertainment and includes members JR, Aron, Baekho, Minhyun, and Ren.