UNIONBAY spokesmodels IU and Seo In Kook recently posed for the brand's summer catalogue. Star photographer Kim Hyun Sung led the photoshoot, and its said that both singers showcased perfect synchronization, impressing all the staff members. In fact, the bold singer and rising teen star are reportedly fairly close, as they support and cheer each other on during their respective album promotions. Their bright friendship can be seen through the fashion catalogue, thanks to the bright smiles and energetic poses. IU and Seon In Kook donned various looks for the shoot, including the 'striped marine look' and the 'vivid casual look'. Check out the photos below: [gallery] Source: Newsen via Nate