After School's Lizzy will be collaborating with indie artist Andup for something they like to call the 'Cupcake Project'. Lizzy tried out the neo hip-hop genre with one of the most popular underground rappers. He was actually the youngest rapper to make it to the semi-finals of the national rap battle Freestyle Day, at 15 years old. His single from his album The Speaker of Teens was also nominated for Hip-hop Playa′s Song of the Year.

Producer Kim Kun Woo made the collaboration between Lizzy and Andup possible. He is also responsible for others such as Miryo and Girls′ Generation′s (SNSD) Sunny, Kim Jin Pyo and Jandi and MC Mong and Mellow.

The title is called 'Cosmetic' speaks about how the heart cannot handle a breakup, and how it will not know how hard the breakup will actually hit it. With Lizzy's wonderful vocals and Andup's amazing rap skills-they mix in such a way that would cause unique harmony.