A few days back, singer Seo In Guk released a mysterious MV teaser that threw out a bunch of questions like, "Who? - Someone, Where - Seo In Guk's Home". These questions were finally answered in the full music video for his new song, "Shake It Up"! "Shake It Up" is the work of American composer Drew Ryan Scott, who's already worked with countless of different Korean singers already. The album jacket cover was designed by Mina Kwon, who's illustrated for the likes of Chris Brown and Sean Kingston. Producer Hwang Se Jin, who's known for his stunning arrangements of Jang Hye Jin's songs on MBC's 'I Am a Singer', is also the project's head director. Under such a strong foundation of support, Seo In Guk's "Shake It Up" will surely be the summer theme song for many for years to come. The star also invited a bevy of stars to cameo in his fun music video, including Jewelry, Mighty Mouth, T-ara's Jiyeon, and�Norazo. Rocking out to the happy-go-lucky track, these stars seemed to have a blast at Seo In Guk's glow-in-the-dark house party. Check out the MV below! Source: Sports Chosun via Nate Tip: semsem