In near-future Seoul, helper robots Oliver and Claire are feeling lost. Their lives change when Claire borrows a charger from Oliver, sparking a connection. Oliver hopes to reconnect with his original owner, while Claire dreams of seeing fireflies, and they decide to journey to Jeju Island together. Along the way, they unexpectedly fall in love. But their happiness is short-lived as Claire experiences a critical malfunction. Facing a difficult fate, the two robots discover the profound impact of love.