Two teenage girls form a close friendship and romantic connection. Their journeys take them to Seoul, where they experience various emotions and challenges together. Despite distance and time constraints, their bond remains strong.

Hye-jung works in a factory on the outskirts of the city. All she wants is to live alone in peace. One night, however, she finds she has become a ghost. As a ghost, she goes back in time, day by day, and tries to keep out of harm's way.