Plot - A time-travelling love story about an architect and girl living at a sea house two years apart in time, but are able to communicate through a mysterious mailbox.
Eun-joo leaves a letter for the future resident at a sea house named ‘II Mare’ asking to forward her mail. Sung-hyun, an architecture student received the letter but is puzzled as the letter is dated 1999 while he is in 1997. Soon, both of them realize that they are living two years apart in time and are able to communicate via the mailbox. They both develop a liking for each other and start dating.