Lee Seong-hwa, better known by his stage name Gray, is a South Korean rapper and record producer. In 2012, he released his debut single "Blink". In 2021, he released his first studio album Grayground.

Shin Hyo-seob, professionally known as Crush (크러쉬), is a South Korean record producer and singer-songwriter. Crush often uses Jazz musical instruments in his style of music, implementing modern tunes. He debuted on April 1, 2014, with the single "Sometimes" and released his first album Crush on You on June 5, 2014.