As Eun-young tries to forget Jae-ha, she returns to Korea and there, Jae-ha appears again... "Spring Waltz" was the final feature of the season-themed drama series directed by Yoon Seok-ho. Although the story shares the similar format of genuine love and childhood memories, Yoon adds several fresh twists and turns. In this miniseries, the drama's message is conveyed more actively through the season "spring". Love is compared to the way spring blossoms into lives, bringing a sense of hope. Love is also depicted as gently embracing the protagonists' lonely hearts, which are chillingly numb in the midst of a long and harsh "winter". Another noticeable change is that this series is the only feature out of four season series to include overseas locations, namely Austria, where filming took place around well-known tourist spots such as Hallstatt and Salzburg. Moreover, most of its production money came from external sources and investments made by domestic and foreign interests. With news that the drama was sold to nine countries including Japan, Taiwan, Thailand, Hong Kong, Singapore, Malaysia, Macau, Brunei and the Philippines, the series garnered widespread attention from the media industry even before the series aired in March 2006. One of the most striking differences from previous installments, is the casting. All four main characters are relative newcomers, who were cast in the leading role for the first time. The casting of the two lead actors – Seo Do-young (a model-turned actor who previously appeared in small supporting roles in a few TV shows) and Han Hyo-joo (a newbie actress best known for the teenage sitcom "Nonstop 5") - brought a controversial yet refreshing spin into the drama's production. Sung Yu-ri was originally cast as Eun-young but when she backed out of the drama, Yoon unexpectedly chose Han, who had auditioned for a smaller role. Model-turned-actor Daniel Henney was perhaps the most high-profile actor of the four, after his role in 2005 hit "My Lovely Sam Soon". Initially the character Philip character did not exist. However, after seeing Henney audition, Yoon was attracted to the actor's unique facial expressions and gestures, so the director decided to create a new role just for him. Lee So-yeon, on the other hand, had more experience in TV and film, notably "Untold Scandal" in 2003. In interviews, Yoon told the press that he deliberately chose to work with new actors rather than already-established actors, who tend to have chiseled images that do not have enough flexibility.