tripleS's first sub-unit, 'Acid Angel from Asia,' is set to debut in October.

On September 16, On the tripleS official YouTube channel, it was announced that tripleS will be debuting two sub-units with the current eight members of tripleS.

The first sub-unit to debut is Acid Angel from Asia, which will start their debut promotions in October.

The second sub-unit is called +(KR)ystal Eyes, it is currently unknown when this sub-unit will begin promotions. 

Starting from September 21, fans of tripleS will be able to vote for which member, out of two member choices, they want to be in which sub-unit; there will not be any overlapping members.

Additionally, Fans of tripleS have noticed on Jaden Jeong's Instagram, tripleS' company CEO, that he has been preparing for Acid Angel from Asia as early as 2019.