Who is the Duke of Zhou vaguely?

Yesterday, I had a vague dream. Now there is no Yu Di on a cold night, and the snow is gone. What does it mean to listen to heartstrings by the curtain?

Meaning: vaguely: vague. Existence: existence. Yudi: The flute. Broken snow: The ground is covered with unconnected snow. Sunset: Sunset in the west. Side: next to; Corner. Heartstrings: the heart; Being moved can resonate.

Meaning of the poem: I can still remember some vague dreams I had in the past. Today, on a cold night, I can't hear the melodious and crisp flute. The setting sun shines on the scattered snow, and the warm spring has not yet arrived. Who will open the curtain and listen to the flute?