f(x) visited the Yeosu Sea.

f(x) Amber posted on her twitter, "We are at the Yeosu Sea. It is so nice. See you later," along with a photo.

In the photo, Amber, Krystal and Luna are standing in front of the sea with a strange pose. Amber is in the middle with her arm raised high with Luna and Krystal on either side of her, posing like Superman.

f(x) was at the Yeosu Sea to attend the Yeosu Expo Festival. They had arrived a bit earlier and decided to explore the area before the concert.

Internet users commented, "It's the super girls," "They are perfect" and "Where are Sulli and Victoria?"