Girl group f(x) revealed a picture on the last day of their song, "Rum Pum Pum Pum" performance.

Yesterday, f(x) posted on their Facebook, "f(x)'s Pink Tape album promotion officially ended. Thank you all for the wonderful memories!" along with a picture.

In the picture, the members of f(x) are wearing red-checkered stage outfits, making their own unique faces.

Internet users who saw this commented, "f(x) is already stopping," "I'm so sad," and "Krystal is so cute."

Photo Credit: f(x) Facebook