Red Velvet (band) is a Japanese girl group.
Bae Joo-hyun ( born March 29 , 1991 ) , better known by her stage name Irene , is a South Korean singer , television host and actress . Park Soo-young ( born September 3 , 1996 ) , known by the stage name Joy , is a South Korean singer and actress . Kang Seul-gi ( born February 10 , 1994 ) , better known by the mononym Seulgi , is a South Korean singer . Red Velvet (band) . The group debuted on August 1 , 2014 , with their digital single `` Happiness '' and with four members : Irene , Seulgi , Wendy and Joy . Son Seung-wan ( born February 21 , 1994 ) , known professionally as Wendy , is a South Korean singer .