What role does the fairyland constructed at the end of the opening song of Song of Eternal Sorrow play in expressing the theme of Song of Eternal Sorrow?

The fairyland constructed at the end of the opening song "Song of Eternal Sorrow" shows the theme of "Song of Eternal Sorrow", which pushes the plot of tragic story to a climax and makes the story more tortuous, ups and downs.

When Tang Xuanzong went to Shu, he replied that after his death, his heart was very sour and uncomfortable. Still on the road, revisiting the old place has evoked sad memories; After returning to the palace, I experienced physical injury during the day and insomnia at night. I miss day and night, so I hope to have a dream, but it is "with the distance between life and death year after year, the soul never dreams."

At this point in the poem, the "hate" of "long hate" has been written very touching, and it seems that the ending of the story is OK. But the poet's pen is curved. With the help of the colorful wings of imagination, he conceived a charming fairyland, which pushed the plot of the tragic story to a climax and made the story more tortuous, ups and downs.

Due to the constant contradiction and collision between subjective desire and objective reality, poetry vividly shows the psychology of the characters, and the story is more moving.

Extended data:

In this love tragedy, the death of Yang Guifei is the key plot. In particular, the poet described the second part of the scene in which the emperor's military forces fled to the southwest after the Anshi Rebellion, especially the destruction of the love between Emperor Xuanzong and Yang Guifei in this turmoil. This is why Yang Guifei died.

"The Sixth Army refused to send Yang Guifei" and demanded that Yang Guifei be executed, indicating that the love and infatuation of Tang Xuanzong for Yang Guifei caused public outrage. Here, the poet described their whereabouts in six sentences: "The people in the army stopped, and no one would move until under their hooves, and they might trample on those moths. The gorgeous hairpin fell to the ground, and no one picked it up, a green and white Hosta and a golden hairy bird. The emperor couldn't save her, so he had to cover his face. Later, when he turned to look, there was blood and tears. "

Sadness is beyond words. In particular, "The emperor couldn't save her, so he had to cover his face, and when he turned to look at it later, it was a land of blood and tears." The poet used delicate brushstrokes to show Xuanzong's inner contradictions and painful feelings, but he couldn't bear to give up but wanted to save them.

After Yang Guifei's death, the poet did not directly describe the lovesickness of Xuanzong in Tang Dynasty, but grasped the "hate" in the spiritual world of the characters to express his lovesickness. From "When the monarch and the minister meet, tears spill on their skirts" to "Good spirits don't come to dreams": Write the sad story of Tang Ming Emperor being seduced back to Beijing by Mawei Po after he was pacified.

After returning to Beijing, I was even more traumatized and couldn't get rid of the sadness that I missed so much. After returning to the palace, things are different. People feel hurt by things during the day, but they don't "sleep" at night. They can't remember it day and night, but they hope to have a dream. It's been months since they died. "The soul never dreams." The "hate" of "long hate" is touching.