Kpop star Lee Ji Eun, popularly known as IU, opened up about her family, especially about her brother during a tvN show. IU's brother is said to have enlisted in the military, but pretends that he is in no way related to IU. Except for his close friends no one knows that he is IU's younger brother. This is not the first time he is trying to be secretive about his sister. In fact, he has done it ever since she became popular, said IU.