According to DSP Media, Rainbow's Hyunyoung is to release a collaborative track with rapper Sool J, adding on to the array of collaborations that have been released this past year.�

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On December 26, DSP Media released the album jacket along with the title of the digital single, "Oppaya." In the album jacket, an illustration version of Hyunyoung's image is reflected on Sool J's sunglasses, suggesting the rapper's infatuation for the idol.�

Hyunyoung also expressed her excitement for the release as she stated, "These days, there are a lot of collaboration tracks, and I'm also taking on this challenge. I'm very happy. Please support me."�

In addition, Sool J also tweeted the same picture of the album jacket to further promote the release.�

Meanwhile, "Oppaya" will be released on December 30.