Seo In Guk and Zia have come together for a beautiful duet! The pair's just released "Breaking Up Man and Woman", a minor pop-ballad with a little bit of R&B mixed in. Its acoustic guitar and cello introduction is the charming point, and the realistic lyrics are performed by their beautiful voices. The pair sing about a couple who's looking at their upcoming breakup. At times, the song is calm, and at times it's explosive, but their voices match perfectly from start to finish.