Although f(x) haven't been promoting for very long and fans had been patiently looking forward to their comeback for about a year, it appears that their promotion for "Red Light" might already be at its end.

Their studio third album, 'Red Light,' was released on July 7, and the girls have been consistently winning first place on music programs, but it looks like they are stepping on the brakes in light of member Sulli's current illness, which already prevented her from appearing on many music programs starting from July 16.

SEE ALSO: f(x)'s Sulli ill with cold, unable to film for 'Music Bank'

She did appear on SBS's 'Inkigayo' on July 20 as it was pre-recorded, but the official home page for the girls shows that their entire schedule, despite being in the midst of promotions, has been erased, raising curiosity.  Meanwhile, f(x) did not perform on the July 23 edition of 'Show Champion.'

Most comebacks run for at least three to five weeks, so it is surprising that f(x), which have been very successful with many music show wins so far, are ending after three weeks.  Not to mention, Sulli had said before the girls' first comeback stage, "We always performed for a short time, but we want to try doing it for a while this time."

An SM rep told TV Daily on July 24, "We are figuring out how f(x) promotions should continue or not and Sulli's current condition."  Stay tuned.