The cast of "You’re the Best Lee Soon-shin" -- (from left to right) Lee Ji-hoon, IU, Kim Yun-seo and Cho Jung-seok, who play leading roles in the upcoming KBS drama pose for a photo call during a press conference in Seoul on Monday. (Yonhap News)

Singer and actress IU poses for a photo call during a press conference for KBS’ new series "You’re the Best Lee Soon-shin" in Seoul on Monday. (Yonhap News)

Actress Yoo In-na poses for a photo call during a press conference for KBS’ new series "You’re the Best Lee Soon-shin" in Seoul on Monday. (Yonhap News)