Kim Hyo-jin, better known by her stage name JeA (Korean: 제아), is a South Korean singer and songwriter. She is best known as the leader of South Korean girl group Brown Eyed Girls. As a solo artist, she has contributed numerous songs to various soundtracks.

Cho Joong-hoon, better known by his stage name Cho PD, is a South Korean record producer, rapper, and the founder of record label Stardom Entertainment. Producing his own music for himself and his crew Stardom, he rose to prominence through the internet then debuted in 1998. Later, he also would support other artists like Psy, Verbal Jint and a young Dok2 earlier in their careers. After twelve years, he briefly "retired" from music in 2010. However, he came out of retirement in 2011 with his two studio albums, State of the Art and Art of Business.