tripleS confirmed its new subunit's debut date. 

On January 22 at midnight KST, TripelS announced its new 10-member subunit's debut date with a concept photo of member YooYeon. Named 'Rising', the new 10-member subunit will be releasing 'Assemble' on February 13th. 

tripleS is a rookie girl group with 24 members and a unique system called "Dimension." Under this system, fans get to choose the members who will be part of the subunit group promotion through voting. 

Stay tuned for updates on tripleS.