Wang Chunshi's first couplet is lyrical by borrowing scenery. Can you tell me specifically what the poet feels?

Chang' an fell, the country was broken, and only the mountains and rivers remained; Spring has come, and the sparsely populated Chang' an city is densely forested.

Sad state, can not help but burst into tears, amazing birds, leaving sorrow and hate.

The war lasted for more than half a year, and letters from home were rare, with a hundred thousand gold.

Twisting with melancholy, scratching my head and thinking, the more I scratch my white hair, I can hardly insert a hairpin.

"Although the country is divided, the mountains and rivers remain forever, and the vegetation turns green in spring." At the beginning, I wrote what I saw in spring: the capital fell and the city was broken. Although the mountains and rivers are still there, there are grass everywhere and the trees are gray. A word "broken" makes people stunned, and another word "deep" makes people sad. The poets here clearly describe the scenery, but in fact they express their feelings, pinning their feelings on things and scenery, creating an atmosphere for the whole poem. The antithesis of this couplet is ingenious, mature, natural and poetic. "National Break" is opposite to "City Spring". The ruins of "the country breaks down and the family dies" are in sharp contrast with the "urban spring" of commercial prosperity. "The country is broken" is followed by "the mountains and rivers are here", which means the opposite and is unexpected; "Spring in the city" was originally a beautiful scenery, but the suffix "deeply planted" is ridiculous and contradictory.