Princess Hours (2006)

Spirited art student Shin Chae-Kyung's life turns upside-down when she is told she has been betrothed to her classmate, Lee Shin, who also happens to be the crown prince of South Korea. To save her family from debt, she agrees to the marriage. But complications arise from all sides. The newlyweds can barely stand each other. Shin still pines for former girlfriend and ballerina Min Hyo Rin. Chae-Kyung finds adjusting to palace life difficult. And after years abroad, Lee Yul returns. A past family scandal had displaced him from the line of succession. Now, he is caught between his mother's machinations and his growing feelings towards his cousin's young bride.