Birthday Letter

This series is set during the Korean Independence War in 1945, and celebrates the Chuseok Party. During the Japanese colonial rule era, Kim Moo-gil (Song Geon-hee) and Yeo Il-ae (Jo Soo-min) are childhood friends who are each other's first love. Against their will, they both have to leave Hapcheon, South Korea and go to Hiroshima, Japan for conscription. There they are separated from each other and suffer an atomic bombing. Later, in 2019, they finally return home alive, and Moo-gil, now Jeon Moo-song, receives a birthday letter from his first love Il-ae, now Jung Young-sook.