On the White Road (2010)

Jiang Yongshu, an old man with memory problems lives alone in a retirement home at the outskirts of Beijing. One day, by accident, he discovers in his drawer some photos and letters dated in the 1970s. The letters were sent by his wife during the Cultural Revolution. Yongshu, who has even forgot about his own wife, decides to escape from the retirement home and try to find the address from which the letters were sent, only to find out at the end that today there is a restaurant of a famous fast-food brand.