IU received a round of  loud applause after performing the rock version of her hit song, "Good Day".

On October 11th, IU had a special 60 minute live concert for the filming of MBC's 'Real Modern Concert'.

IU took time off from her break after finishing her three month long national tour and performed six of her songs including "Good Day" and "Peach" live.

IU especially received cheers and applause from the music staff on site and from MC Lucid Fall for arranging her hit song "Good Day" into an acoustic rock version with a live band.

After the filming, IU had tweeted, "I filmed Lucid Fall uncle's 'Real Modern Concert'. Ah, I probably won't get tired filming this program three times a day. Regardless of whether I sang well or not, I feel good. I'm happy when I'm singing. Today, I felt that happiness for a long time."

Meanwhile, the producers of 'Real Modern Concert' have revealed a clip of IU's rock version of "Good Day". Check it out below and stay tuned for the airing of 'Real Modern Concert' on October 17th at 12 am KST.