LUCY is a four-member band under Mystic Story. The band is named after a dog they used to play with, who lived near their practice space.

All members participated in the survival show JTBC SuperBand. The band consists of Cho Wonsang, Choi Sangyeop, Shin Gwangil, and Shin Yechan. They officially debuted on May 8, 2020, with the album Dear and the title track “Flowering.”