Synopsis
After her father dies, So-hee (Kim Hee-sun) writes letters to him believing he has gone to Mars instead of Heaven. Her kind-hearted neighbor Seung-jae (Shin Ha-kyun) does not want to let this innocent girl down and starts writing back to her posing as her father. Years later, this young girl turns into a successful career woman and the helpful young man becomes a postman. Even though these two people may seem to be worlds apart in, Seung-jae still saves his heart for So-hee while So-hee gets lost in her 24-7-business world. One day this young lady who once believed her father had gone to Mars finally finds out who always writes back letters sealed with love. But Seung-jae is now out of sight...

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