"But seeing the sun, despite its splendor, why is it melancholy at dusk?"
Zhu Ziqing changed Li Shangyin's poem "to see the sun, for all his glory, buried by the coming night" and got this sentence. It means positive optimism and perseverance in reality.
Change the meaning of sadness in the original sentence, and change the original period of sadness to as long as it is beautiful, then we will enjoy it to the fullest, and why worry about the short time.