IU's song "Flu" is included in his fifth regular album "Lilacs". I in the stage name IU refers to myself, and U refers to the audience, which means I hope I can stay with the audience forever, and I hope my singing function will make the audience sing along. She was born in Seoul, South Korea on May 1993. She is a Korean female singer, actress and host.

Because of her sweet appearance and lovely temperament, IU is affectionately called the national sister by the Korean people. With her lovely style, she quickly became popular, and the following songs such as Good Days and nagging ushered in the peak of her acting career. Her singing skills are very strong, and the three high notes are even more admirable. She expressed her ideas through songs and won praise from many peers. The constant maturity of music made her evolve from an idol to a real singer.