เพลงในอัลบั้ม Why isn't love always easy? (Romance 101 X JOY)1왜 사랑은 언제나 쉽지 않을까? (바른연애 길잡이 X 조이 (JOY))Joy (Red Velvet)03:412왜 사랑은 언제나 쉽지 않을까? (바른연애 길잡이 X 조이 (JOY)) (Inst.)Joy (Red Velvet)03:41อัลบั้มอื่นของ Joy (Red Velvet)내 입술 따뜻한 커피처럼 (남은 인생 10년 X 조이 (JOY), BIG Naughty (서동현))푸른 밤 이 노래The One and Only, Pt. 4 (Original Television Soundtrack)Hello - Special AlbumJe T'aimeHOSPITAL PLAYLIST, Pt. 2 (Original Television Soundtrack)
