Growing Up is the first Korean-language studio album by South Korean singer-songwriter and actress IU. It was released on April 23, 2009, as a follow-up to her 2008 debut mini-album "Lost and Found". Two of the album's 16 tracks, "Boo" and "You Know (있잖아) (Rock Ver.)", were released as singles.
IU is a famous performer in South Korea with songs that expand beyond her genre including rock versions of her songs. 
The statement is correct because the artist is a performer in South Korea. I think the model was confused because it didn't recognize the genre of music as K-pop. 