4. SON GAIN
Son Ga-in was born September 20, 1987, better known mononymously as Gain, is a South Korean singer, actress and entertainer. She is best known as a member of the South Korean girl group Brown Eyed Girls and for her appearances alongside Jo Kwon from 2AM for TV shows We Got Married and All My Love. As a solo artist she has released six EPs. She is known for her sexy small eyes with her sexy dance move. However, in real life, she has an actor boyfriend, Ju Jihoon.