The fun ladies of SM Entertainment girl group f(x) will show a more casual, fun-loving side of themselves with a new TV project.

The four members of f(x) have been cast in an online prank series that will last eight episodes. Titled "f(x) = 1cm," the first episode will be released through Naver TVcast on November 10 at 11 AM KST.

Although not many details for the show have been released yet, the program appears to be a sort of hidden camera reality show where the pop stars will prank unassuming people.

The description on Naver for the upcoming project reads: "You open your eyes and f(x) is in front of you? f(x) is in my seat? I'm going to look for f(x)! Hidden camera 1 centimeter in front of f(x)."

In addition, a few photos of the members of f(x) wearing school uniforms were uploaded on Facebook. From the pictures, it looks like the 4 members went to a high school and held a surprise event. Luna also uploaded a photo of herself in a classroom on her personal SNS account, teasing fans for the upcoming series. 

f(x) recently made a comeback with the album "4 Walls" and the lead single of the same name.

The new series will air from Tuesday to Friday starting this week, so tune in!