Watch One on One Full Movie Free Online 123Movies. After years of ignoring the shy cousin whom she and her peers taunted mercilessly as a child, a middle-aged woman (Ingrid Thulin) wrenches the poor man (Erland Josephson) out of his self-chosen solitude to accompany her on a trip. Despite developments which deepen their knowledge of one another, the communication between them does not portend long-lasting intimacy.