f(x)'s Krystal and Luna revealed their cute self-taken pictures. 

Krystal wrote on her me2Day on Sunday, "This is another picture that was from a while ago. This was when we were happy and were taking a lot of pictures."

In the picture, Krystal and Luna were close to each other and making cute facial expressions. Krystal kissed Luna on the cheeks and attracted attention. 

Internet users have commented, "They both look so sweet," and "I want to be kissed by Krystal too."

f(x) has recently been busy with their individual activities.

Photo Credit: Krystal's me2day