Boa Kwon ( born 5 November 1986 in Guri , Gyeonggi-do , South Korea ) is a South Korean singer . She is commonly known by her stage name BoA . Boa Kwon ( , Kwon Boa , born November 5 , 1986 ) , commonly stylized and known by her stage name BoA , which is a backronym for Beat of Angel , is a Korean singer , active in South Korea , Japan , and the United States .