In response to news that reported on her apparent rude attitude during a recent Quiz That Changes The World episode and making headlines, f(x)'s Krystal has made a swift apology through f(x)'s official website on June 6th. Krystal wrote,

"Hi, this is Krystal. I'm sorry that I was impolite during a broadcast earlier and have disappointed a lot of people. I have been reflecting a lot since. I will take extra care to make sure this doesn't happen in future and will show you a better side of me. Please continue to watch over me. I am sorry for my careless actions and making my fans worry. Once again, I apologize to my seniors."