Red Velvet (Hangul: 레드벨벳) is a five-member South Korean girl group formed by S.M. Entertainment in 2014. They made their debut with the digital single "행복 (Happiness)", which was released August 4, 2014. The group originally consisted of four members: Irene (아이린), Seulgi (슬기), Wendy (웬디), and Joy (조이). In March 2015, Yeri (예리) was added to the group. Three of the original four members of Red Velvet were previously part of S.