f(x)'s Krystal delighted fans with a cute selca update that showed off her close friendship with�Sulli. On August 21st, Krystal posted on her me2day, "Late reply: I only need you, too." This was a response to Sulli's comment from August 12th, which stated, "Sujong [Krystal's Korean name], I only need you." In the picture, Sulli and Krystal are seen posing side by side, puckering their lips for the camera. Fans could feel the close bond between them, as the two girls took pictures side-by-side. Netizens commented, "You two are totally beautiful", "The two of you look like sisters", and "You really are close friends." Source: Star News via Nate