Belting out "I like you oppa, what should I do" in her hit song, "Good Day," IU quickly rose to the top of the list as the nation's next younger sister and was adored by many uncle fans. However, as she gradually made her way into appearing on variety shows, we were shocked to see that IU was not so child-like as she seemed. For one, IU does not have a cute, high-pitched voice that we all thought she would have. Actually, it's quite deep. And her unexpected comments such as, "When girls are rushing to go out, they sometimes only wash their bangs," shows that she has a hidden tomboy, easy-going, and surprisingly mature personality behind her baby face.