这是个由婚约展开的一段恋爱故事。斋森美世出生于异能家族，却没有继承任何能力，被继母与同父异母的妹妹当作佣人般对待。然而早该谈婚论嫁的她，婚约的对象竟是传说中冷酷无情、拥有同样异能的久堂家家主——久堂清霞。这门婚事是通往黄泉的邀约？还是奇迹般的相遇呢？

　　When school teacher Harriet Winslow goes to Mexico to teach, she is kidnapped by Gen. Tomas Arroyo and his revolutionaries. An aging American, Ambrose "Old Gringo" Bierce also in Mexico, befriends Gen. Arroyo and meets Harriet. Bierce is a famous writer, who knowing that he is dying, wishes to keep his identity secret so he can determine his own fate. Though he likes Arroyo, Bierce tries to provoke the General's anger whenever possible in an attempt to get himself killed, thus avoiding suffering through his illness. Winslow is intrigued by both Bierce and Arroyo, and the men are in turn attracted to her. She becomes romantically involved with Arroyo. When Winslow learns of Bierce's true identity (a writer whose work she has loved and respected for years), she is singlemindedly determined to fulfill his dying wish.

　　韩星贤（李政宰饰）搬到一个海边小屋，他为房屋取了一个意大利文的名字“Il Mare”，意思是“海”。整理房子时，他在信箱发现了一封内容很奇怪的信，信上写着“我是你搬来前的上一个房客，如果有收到我的信，请寄来”，更奇怪的是这封信寄出的日期是在1999年，也就是两年后——而星贤现在的时间是在1997年。星贤就立刻回信给这莫名其妙的人，询问是怎么回事。
　　1999年的金恩珠（全智贤饰）是个配音员，她发现回信的内容后，就开始常常写信给两年以前的星贤。男朋友去美国后已很少和她联络，后来他从美国回来，却已订婚。心碎的恩珠写信给星贤，拜托星贤到当年她和男友最后见面的那一天，去改变他们的命运，但星贤觉得很痛苦，因为他已爱上了恩珠……