Missing Yu Fangfang

The female teacher disappeared. I don't know if she was washed away by the Yellow River somewhere and enjoyed a peaceful world from now on, or she was kidnapped and hidden in a dark corner and isolated from the world, or she went to some remote and remote place to become the math teacher she always wanted to be. No one knows, and no one cares. But Yu Fangfang knew where she was going and what she was going to do.