Saturday (세러데이) is a South Korean girl group that debuted under SD Entertainment. Their current lineup consists of 5 members: Haneul (하늘), Juyeon (주연), Yuki (유키), Ayeon (아연), and Minseo (민서). On July 18, 2018, they debuted with 7 members with the single "MMook JJi BBa." The original lineup (from oldest to youngest) was Sion (시온), Sunha (선하), Haneul, Chaewon (채원), Chohee (초희), Yuki, and Ayeon. Chaewon left the group on December 1