The group always worked without appearing in public until the official debut, which took place on February 25, 2014, with the first mini-album and single Another Parting, whose title track was used in the soundtrack of the web drama of the same name with Seo In-gook and Wang Ji-won. In April, they performed an acoustic cover of A Pink's "NoNoNo",while on May 21 they collaborated with Changmin of 2AM for the song "The Very Last First",and on August 14 with Lee Jong-hyun of CNBLUE for "To Tell You the Truth".It followed a track for the original soundtrack of Fated to Love You, "You're My Everything", remake of Jeff Bernat's "Be The One".
In October 2014, Melody Day decided to add a fourth member, Yoo-min,The first song released as a quartet was "Listen to My Heart" for Cantabile Tomorrow OST.