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KBS deemed "Red Light" unsuitable for broadcast due to its mentioning of a brand name. One portion of the lyrics referred to the international equipment manufacturing company 'Caterpillar'.

As for MBC, they have revealed that they are still reviewing it, stating, "f(x)'s new album 'Red Light's title track of the same name as well as its music video have been received [for review]... Because we deliberate on a weekly basis, the decision concerning whether or not it meets the qualifications for broadcast has not been made yet. Through the deliberation, we will make a decision within this week."

An SM Entertainment rep responded that they will adjust the lyrics, "We will edit the problematic lyrics and send it in for reexamination... We will make sure that f(x)'s broadcast activities go according to plan."

Let's hope it will be smooth sailing from here on out for f(x)'s comeback with their 3rd full-length album 'Red Light' on the 7th!