tripleS's ballad subunit, tripleS Aria is next to make their debut! 

Gearing up to their final debut, tripleS Aria has unveiled a series of solo and group teaser images entitled "Structure of Sadness" for their 1st single with the title track "Door." The subunit consists of Dahyun, Nien, Chaeyeon, Jiwoo, and Kaede.

 Check out the full solo and group teaser images above and below!

Meanwhile tripleS Aria's 1st single "Door" will be released on January 15. Are you looking forward to it?