小喜（金喜善 饰）的父亲早逝，然而，这么多年过去了，善良单纯的小喜却一直相信着，父亲其实是去了火星，因此，每当想念父亲之时，小喜都会写下寄往火星的信件，而回信的责任，便落在了小喜的青梅竹马胜在（申河均 饰）的肩头。 之后，小喜离开了家乡外出闯荡，并且邂逅了本以为是一生挚爱的男子，可是，残酷的生活带给小喜的却只有失去和伤痛，这让小喜猛然醒悟，发现原来最爱的人其实是一直对自己不离不弃默默陪伴的胜在。怀揣着一颗伤痕累累的心，小喜终于在离家十七年之后重新回到了故乡，然而，这一次胜在却没有等他，因为他已经离开了人世，前往了那个名叫“火星”的地方。Little Seung Jae stays up all night and writes letters to So Hee, pretending to be her father in Mars. Leaving Seung Jae's innocent heart behind, So Hee leaves for a big city. Both grown up to be adults, Seung Jae is a postman who writes letters to So Hee's grandma - the letters that never came from So Hee. So Hee's heart hardens after hardships in life and she comes back to her hometown and Seung Jae's heart swells up again at seeing her again.
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