A lonely doctor who once occupied an unusual lakeside home begins exchanging love letters with its newest resident, a frustrated architect. When they discover that they're living two years apart, they try to unravel the mystery behind their extraordinary romance before it's too late.

When Scotty discovers a poignant letter written by a mysterious woman called Lizzie he cannot get her out of his mind. Putting thoughts of his upcoming wedding aside, he is compelled to write Lizzie a letter of his own. A romantic correspondence ensues and flourishes into a love so powerful, not even a century and a half of time can keep them apart. Spanning an era from the Civil War to the present day, the perils of Lizzie's war torn present threaten...

Yuan Zhilan attends a class reunion in place of her sister Yuan Zhihua, who recently passed away. While there, she reunites with her high school sweetheart and her story slowly unfolds as they communicate through letter writing.