The agency PlayM Entertainment released track trailer videos of Jeong Eun-Ji's fourth mini-album "Simple" one by one on Apink's official SNS and fan cafe at midnight on the 9th and the 10th, drawing attention.

The first track "Simple is the Best" video, which was released first, captivated viewers with Jeong Eun-Ji's image of completing the album's name with paint, her cheerful melody and a clear voice. 

The video, which was then released, was "Whoo," the next track after the title track "Away," and the song "Same Words" and the scene of blowing out candles "Whoo" drew curiosity. "Whoo" is a song that Jeong Eun-Ji worked with Sunwoojunga following the song "The Box" from her third mini-album "暳花," and expectations are high on what synergy the combination of the two artists will create.