Idol songwriting project "IDOL x IDOL" is a special collaboration project in which idol members representing K-POP unite as a "one team" to create music. Lovelyz Kei and WJSN Exy meet for the first time on this program and go on a two-day trip to get closer. Following this trip they take on the challenge to make a new song where one of them composes the song and the other writes the lyrics.