Tawat, a young millionaire secretly in love with Namtip, disguises himself as a mail-man and delivers his own love letter to her every day. One day he got bitten by her dog, so she invites him to have dinner in her house just to compensate for what her dog has done to him. After that, they always chat every time they see each other. Namtip start to suspect about those love letters she receives, so she asks him to find out about the sender. He loves her even more when he sees that she helps pay the hospital fee for a mother of a young child. He ask her for and she is a bit mad about the truth, but gladly accepts his offers.