tripleS members dropped a surprise cover of Ariana Grande's song 'They Don't Know' for fans

Members SeoYeon, JiWoo, YooYeon, and NaKyoung have released a cover of Ariana Grade's 'They Don't Know' with a fun music video. The cover shows off their vocals ahead of their first debut in October.

Fans believe that the members surprised the fans with this cover video after announcing on September 16 that they will be up against each other when fans make the decision of which sub-unit they will be in.

Check out the full video below.