Love Crossed a Millennium

Xu Qing goes out on a wet night and finds a woman lying in the rain. He takes her in. Jiang He is from the Tang dynasty, a thousand years back, and she has no way of explaining how she arrived. She stays with him while they try to work it out, and living together does what it does. He falls for her. Her mind stays on her family in her own century, and she never pretends otherwise. When the way back opens, Jiang He chooses it, and Xu Qing does not stand in her way and does not ask her to stay. Then time folds. She is returned to the point three days before it all happened, with everything she now knows about him still in her head, and three days in which to arrive at a different answer.