tripleS Kim Yooyeon looks charming in teaser photos for her debut with Acid Angel From Asia.

Previously, a vote was held to decide which tripleS members would be allocated into which subunit, Acid Angel From Asia and +(KR)ystal Eyes.

The first unit to debut was announced to be Acid Angel From Asia debuting in October.

On tripleS behind the scenes show 'SIGNAL' on October 7, the members of +(KR)ystal Eyes said that Acid Angel From Asia had been filming their music video, giving anticipation from fans that the teasers will come soon.

On October 10, at 9 PM KST, the first teaser was dropped of member Kim Yooyeon, the oldest member and a former contestant on My Teenage Girl.