Overview

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...

Top Cast

Shin Ha-kyun

Seung-jae

Kim Hee-seon

So-hee

Park So-hyun

Sun-mi

Kim Min-jun

Seong-ho

Kim In-kwon

Ho-gul

Park Sung-woong

Lim Seung-dae

Lee Jae-yong

Sueng-jae's Father

Lee Geum-ju

Seung-jae's Mother

Jo Deok-hyeon

So-hee's Father

Lee Won-jong

Jeong Gyu-su