Seo Young Joo's role was that of a guy who only had eyes for the lead female character, played by Cosmic Girls's Bona. However, during his interview, he revealed, "I had no idea who the group Cosmic Girls was. I'm not particularly interested in idols. I didn't know [Bona] was Cosmic Girls. But I'll start being a fan now. I am a fan of Cosmic Girls's Bona noona." 

The actor also said that he had a fun time filming a production with fellow actors and actresses his age, and thanked Bona for making the first attempt to become close on set. Did you watch 'Lingerie Girls' Generation'?