Dong-jin takes on a delivery job at the supermarket where Mi-jung regularly shops. Every Tuesday, as he delivers her orders, he begins to test the theory he's been developing about her. Gradually, he pushes the boundaries of his own rules, discovering just how dangerous it can be to remain within a ten-meter radius of her. Yet, despite the growing risks, his deepening desire to be closer to her and to linger in her presence threatens to draw him into ever greater peril.