I Saw a Ghost, and It Was Beautiful (1970)

Miss Eloise, a melancholic property agent, is assigned to manage the vacation of a countryside apartment room due to the sudden disappearance of its last tenant, a blue collar worker at a neighbouring company. However, her whimsical decision to spend the night in the mysteriously abandoned room—fuelled by her desire to flee from her own soporific reality—slowly spirals into a feverish odyssey.