f(x)'s member Victoria and Sulli's relationship was revealed through a video clip.

Recently, an online community forum posted a picture under the title "Can you tie my hair?" The pictures were of f(x) when they were filming for a commercial.

In the picture, Sulli hands a pink ribbon to Victoria, asking her to tie her hair for her. At this, Victoria takes the ribbon and puts it aruond Sulli's head and neck instead.

Sulli looks at Victoria with confused looks but Victoria seems to be having fun, arousing laughter. At the end of the video clip, however, both of them crack up into laughter, revealing their cute relationship.

Photo Credit: Online Community