Girl group SISTAR are gearing up for their comeback, and this time, they'll be transforming into lovely "afternoon party girls"! Earlier today, concept photos were revealed and now the teaser video for their upcoming title song, "So Cool" was released! The teaser also features the members of DJ Doc, check it out below! Bonus track list for their 1st album: 01. Let's get the party started 02. So cool 03. Girls do it 04. Follow me 05. New world 06. 약한 남자 싫어 07. 니까짓게 08. Over 09. Oh Baby 10. 가식걸 11. Push Push 12. Ma boy _special ver.