Deekay wrote for what South Korean girl group formed by S.M. Entertainment?
Red Velvet (band) Red Velvet (Hangul: 레드벨벳) is a South Korean girl group formed by S.M. Entertainment. The group debuted on August 1, 2014, with their digital single "Happiness" and with four members: Irene, Seulgi, Wendy and Joy. In March 2015, Red Velvet added a fifth member, Yeri, to the group.
Toheart (band) Toheart (Korean:투하트, commonly stylized as ToHeart) is a South Korean duo formed by Woohyun from Infinite and Key from Shinee in 2014. It is a collaboration between S. M. Entertainment and Woollim Entertainment.