Kim Mu Gil is an old man who during his old days was forced to work in Hiroshima during Japan’s occupation of Korea. Surprisingly one day he receives a letter from his first love Yeo Il Ae. Kim Jae Yoon who is Kim Mu Gil’s granddaughter upon seeing the letter decides to find his grandfather’s first love and she then discovers about their emotional past along the way. The drama will focus on the painful lives of the youth at the times of Japanese occupation of Korea, Korea’s liberation, and the Korean War.