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...
신하균
as Seung-jae
김희선
as So-hee
박소현
as Sun-mi
김민준
as Seong-ho
김인권
as Ho-gul
박성웅
as
Lim Seung-dae
as
