Song Seung-heon
Lee Sang-yoon, Yoon Seung-ah, and Lee Hyun-jin were originally cast as the main characters (Lee Kang-hoon, Yoon Ji-hye and Seo Joon-suk, respectively), but after the read-through, the producers deemed them "too young" for their roles and the actors were subsequently fired. Song Seung-heon and Kim Joo-hyuk were rumored to be offered the leading role, which eventually went to Shin Ha-kyun.