Almost exactly a year after releasing their last pool-party anthem, Girl's Day return with another summery smash that further shows their musical diversity as a group.

"Ring My Bell" bases itself around the rather-underused harmonica in what's the most striking pop-music use of the instrument since Kesha and Pitbull's Billboard Hot 100 No. 1, "Timber."

The girls go through a multitude of seasonal looks in the video. Most strikingly, the ladies don black-and-white swimsuits and heels to perform twerk-lite moves seeing the girls shimmying, bending and dropping it low for the camera. Look out for the quintet's spectrum of hair colors that includes firetruck red on Yura, sunset orange with pink extensions on Minah, platinum blonde for Sojin, while Hyeri trades in her signature bob cut for long, bluish black locks.

While it's been a year since they last promoted together, Girl's Day did release both the wintry mid-tempo "I Miss You" last October and May's electro-pop treat "Hello Bubble" as one-off singles in between. Amidst their experimenting, "Ring My Bell" proves that a bold, poptastic punch always works well for the group, who have been on a winning streak since changing their quirky-cute image to a deliciously suggestive one in early 2013 upon the release of their first full-length album Expectation.

"Ring My Bell" is the lead single off the outfit's second LP Love, that comes with five new tracks along with singles and standout tracks from their past EPs.