17 days ago 
IU revealed Song Joong Ki and Song Hye Kyo made her nervous at their own concert.
During filming for the October 27th installment of 'Knowing Brothers', IU shared, "Song Hye Kyo, Song Joong Ki, and Park Sol Mi sunbaenim came. When I went out on stage, Song Hye Kyo and Song Joong Ki sunbaenim were way in the front. As soon as I went out there, we looked at each other. I felt like my entire brain went white."
She continued, "We're acquainted, but they just came to see the concert. I was surprised, and I was anxious the whole time. I thought that they would've left for the second encore, but they were still sitting. They were there until the end. I was so nervous that I kept nodding in the middle of the concert. I was that nervous. They contacted me later on. They told me that they had a good time at the concert and are leaving."
Did you know Song Joong Ki and Song Hye Kyo are friends of IU?
During filming for the October 27th installment of 'Knowing Brothers', IU shared, "Song Hye Kyo, Song Joong Ki, and Park Sol Mi sunbaenim came. When I went out on stage, Song Hye Kyo and Song Joong Ki sunbaenim were way in the front. As soon as I went out there, we looked at each other. I felt like my entire brain went white."
She continued, "We're acquainted, but they just came to see the concert. I was surprised, and I was anxious the whole time. I thought that they would've left for the second encore, but they were still sitting. They were there until the end. I was so nervous that I kept nodding in the middle of the concert. I was that nervous. They contacted me later on. They told me that they had a good time at the concert and are leaving."
Did you know Song Joong Ki and Song Hye Kyo are friends of IU?
SEE ALSO: IU channels 4 unique 'Persona's in still cuts for her upcoming 4-part short film series
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she actually have a bunch of famous friends.