D.O gave a hilarious reason to the upsides of an (almost) all-male cast.
D.O and Jo Jung Suk had an interview with KBS 2TV's 'Entertainment Relay' for their movie 'Hyung'. The pair of them are the main cast to the movie along with Park Shin Hye, but it was rare that Park Shin Hye would be on set because the movie revolved mostly around the two brothers. D.O said, "Most of the time, it was just the two of us filming. Since there were no women around, it was easier to do things like change our outfits or pick our nose." Jo Jung Suk added, "We did everything that we could..."
On each other, Jo Jung Suk said, "I thought he was a watercolor pretty boy, but he's actually very masculine. He's very macho. He had been working out [when I first met him],. so he had a firm body." D.O joked, "I really hate working out," and then added about Jo Jung Suk, "I thought he would be very light hearted before I met him, but he's actually very serious."