Girl's Day have revealed the action-packed music video teaser for their project single "Hello Bubble"!

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As previously mentioned, the ladies are currently the endorsement models for the hair brand mise en scene, and they've joined hands with the company for the project single produced by Duble Sidekick. Judging from the teaser, the MV has Girl's Day pulling off a variety of looks and concepts.

Stay tuned for the full version on May 12 KST!