Billlie is bringing back the retro vibe with the new collaboration track "Patbingsu."

'Track by YOON' is a new project by singer/producer Yoon Jong Shin. The first release of 'Track by YOON' features a remake of Yoon Jong Shin's "Patbingsu" and "Freeway Romance" sung by rookie girl group Billlie.

On July 14 at midnight KST, the girls dropped a performance video teaser for "Patbingsu," where they showed off the retro vibe and their cute charms.

Meanwhile, both tracks will be released on July 14 at 6 PM KST. So stay tuned for just a few more hours!