f(x) Krystal and Sulli 'We Argue Because We Love Each Other'

Sulli and Krystal from f(x) showed off their friendship in front of the camera.

On May 28, an episode of 'Amazing f(x)' was aired in which the members of f(x) created a bucket list-things to do before one dies-to complete before their twenties pass them by.

As Krystal read the items on her list, Sulli kept jabbing at Krystal for some of the weird activities she would not do. The banter went on for a while, with neither party able to knock each other out. All in all, it was in good humor.

During an interview, Sulli explained her relationship with Krystal. "That was not us fighting. It is a form of expression of love," she laughed. "People could really mistake our banter as verbal argument but it is nothing like that."

Soon after, upon seeing that Krystal wrote down 'To become invisible,' Sully quipped. "You have to put down something realistic," prompting a big laughter from everyone.