It's from Bai Juyi, a poet in the Tang Dynasty, who missed home on the winter solstice in Handan.
The original poem "I miss my home at night on the winter solstice in Handan" is accompanied by a shadow in front of a lamp with my knees on every winter solstice. If you want to sit at home late at night, you should also talk about travelers.
When I lived in Handan Inn, it happened to be the winter solstice festival. At night, I sit in front of the lamp with my knees in my arms, and only the shadow is with me. I believe that my relatives at home will get together until late at night today, and they should also talk about me as a traveler.