Kang Jiyoung a member of KARA made a birthday cake for her same-age friend Sulli of f(x).

On Thursday, Sulli posted on her me2day, "Thank you, Jiyoung, for making a cake... I'm so touched I love you. See you later everyone" along with a picture.

In the picture, it says on the cake, "Happy birthday, egg yolk. From egg whites." Kang Jiyoung and Sulli are looking at each other with shy looks on their faces.

Internet users commented, "Their nicknames for each other are cute", "94 best friends.”

Photo: me2day