4 actresses/singers are invited to take part in a Netflix project in which a fictional girl group will be formed. Ahn Hyejin and Kim Yongsun, who worked together in a series before, have been dating for 2 years. One is a successful solo singer since she was 15 and the other is famous for doing musicals and Korean dramas. Moon Byul-YI is a songwriter, singer and producer since she was 16 and Jung Whee in is a natural talent found by the producer of the show. The