Park Shin Hye and CNBLUE's Jung Yong Hwa lead the cast of the 2011 MBC drama, "Heartstrings." "Heartstrings" explores the unlikely marriage of classical and modern music, as it comes together in college hallways. Park Shin Hye is Lee Gyu Won, a traditional music student majoring in the gayageum, while Jung Yong Hwa portrays a western music scholar.