Seo Do-young was a promising model before he began his acting career, appearing in numerous runways for the Korea’s leading fashion designers as well as several foreign designer shows such as Gucci, Dolce & Gabbana, and Tommy Hilfiger. During his years as a model, he enrolled in acting classes in pursuit of his ultimate goal, to be an actor. After taking some supporting roles and appearing on TV commercials, he was cast—to everyone’s surprise—as the leading actor for the Spring Waltz, the fourth and final feature of the season-themed drama series by TV director Yoon Seok-ho.