She revealed the behind-the-scenes story of the '21st Century Grand Prince's Wife'! Hahaha

“It was difficult to portray Grand Prince Ian as the public sees him in the drama, as he is so upright and someone people look up to,” he said, adding that he expressed his willingness to appear in the drama after reading the script for the first time and hearing the news that IU would be starring. IU also
"I feel the same way," he reportedly said, revealing that upon hearing the casting offer went to Byun Woo-seok, he read the script imagining himself as Grand Prince Yi An! Hahaha.