After the Japanese kidnap two Korean teenagers and take them to a comfort station to join other girls who are serving as sex slaves, only one of them survives. Decades later, the elderly woman tries to reunite with her friend's spirit.

Sang-jo who has a superpower to see the death's soul, quitted the detective and he 's working for undertaker. His ability makes him to investigate the truth behind people's deaths. One day, A high school girl, Se-eun leaps to her death from the high building. Sang-jo doubts about her suicide and starts investigation that case, and he finds out unexpected secrets behind her death...

"Spirits' Homecoming, Unfinished Story" is part dramatization and part documentary. The film contains scenes from the movie “Spirits’ Homecoming” and testimonials by comfort women who were enslaved by the Japanese Imperial Army during World War II.