First member of LOOΠΔ band. On September 28, 2016, Blockberry Creative released a teaser for the first music video, HeeJin's "ViViD". On October 2, South Korean company Blockberry Creative announced through Naver that they would be debuting their first girl-group through an 18-month long pre-debut project. Following this announcement, teasers were released for the first member, HeeJin, as well as the teaser for an additional music video for the acoustic mix of "ViViD", set in Paris, France. On October 4, the music video for "ViViD" and its accompanying acoustic mix were released.