Why Does the West Wind Lament the Painted Fan?

If life could always be as it was at first sight, why would the west wind mourn the painted fan? In a trice, an old lover's heart has changed, and yet they say an old lover's heart is fickle.

After speaking on Mount Li, half the night passed in the clear stillness. Through nights of rain and the sound of wind chimes, there was never a complaint. What can compare to that faithless young noble in embroidered robes, who once vowed to fly wing to wing and share a branch?