Always in mind (2012)

On a hot summer afternoon, a man visits a woman in her unairconditioned apartment. She has washed and pressed his laundry. He is clearly familiar with the place, has a drink, and gets in bed with her. They make love but she seems forlorn, distant, and sad. When they've finished an hour later, she reminds him not to forget his clothes when he leaves. The cycle repeats the next day. Are they married or are they just lovers. What is the story between this couple?