After death, every soul is assigned a role to help the living overcome hardship — as muses, protectors, and unseen guides. The afterlife follows one rule: no one remembers their past life until they have helped their 717th person. When two souls meet during an assignment, the man has already reached that milestone, but the girl has not. As they continue working together, she reaches her own 717th — and remembers him. He is her father. Reunited yet bound by the laws of the afterlife, they must choose between staying together or letting go to fulfill their own missions.