Flowers by the River expresses the meaning of the last two poems in its own words.

I'm in a good mood, and it's late at night in Fenglin. The environment is beautiful and the weather is just right. How nice! Think about that environment again. There is no one around, only maple trees are full of eyes. Isn't sunset the best environment?

In the last sentence, your present situation is like frost leaves are redder than February flowers. Very incisive