8eight's Lee Hyun and Jewerly's Park Jung Ah performed a duet, singing "30 Minutes Ago", on Music Core. About the duet, Lee Hyun commented, "I was always impressed with Park Jung Ah subaenim's outstanding skills, especially her vocal, which looks like it will fit perfectly with ballad." It perfectly fits indeed, have a look at their beautiful performance. Lee Hyun's solo is currently ranked high in most of the music portal charts.