Sistar19

Sistar19 (Korean: 씨스타19) was the first and only official sub-group of South Korean girl group Sistar and was formed by Starship Entertainment in 2011. The sub-group is composed of Hyolyn and Bora. Their debut single "Ma Boy" was released in May 2011. Their second and most successful single "Gone Not Around Any Longer" was released in 2013, with an EP with the same title. The sub-group disbanded on June 4, 2017, alongside the official group.