The Frost Begins and Turns Red Shortly After

I found the yellowed diary at the bottom of my father's drawer and learned that my name "Wan Qiu" was actually the nickname of my father's first love. When questioned angrily, the mother calmly took out the old photo from behind the wedding photo - the photo showed three young people smiling side by side, and the woman also named Wan Qiu had her arms around her parents' shoulders. It turns out that she drowned to save her mother from drowning, and she asked her father before her death: "Look at every autumn sunset for me." Every year on her birthday, her father always took pictures of the sky. Only now did she realize that there was a tiny time stamp hidden in the lower right corner of those photos: 17:20, the moment of her birth and death.