After temporarily halting her music promotions to keep her health in check, IU is finally back on the stage of MBC's "Music Core" with her new title track, "The Story Only I Didn't Know"! Her mini plus album contains three new songs, including "The Story Only I Didn't Know", "Cruel Fairy Tale", and a bonus piano version of her title track fearing Kim Kwang Min. Her recently unveiled music video for "The Story Only I Didn't Know" amazed her uncle fans in a different light, as it showcased a much more mature image of IU compared to her "Good Day" track. Having already captured many hearts, both in Korea and all around the world, it's a safe bet that she'll do just as outstanding during round two of her music promotions. Check out her performance with Yoonsang down below!