What emotions does Li Yu's ci mainly express?

Li Yu, known as the Empress of the Southern Tang Dynasty in history, reigned for fifteen years. He is not committed to state affairs, but indulges in debauchery, extravagance and debauchery. After the Song Dynasty, he was imprisoned in a deep mansion in Bianjing and lived a miserable life in Lacrimosa. Li Yu is politically incompetent, but he knows everything in literature and art. He is good at painting and calligraphy, appreciating and understanding melody, especially at lyrics and composition. There are 44 existing characters, which are divided into two periods, one before the Song Dynasty and the other after the Song Dynasty. His early ci mainly reflected his court life. After being captured, the poem expresses the pain of national subjugation. Background materials:

Yu Meiren was written by Li Yu in the first month of the second year after his surrender to the Song Dynasty, that is, a whole year after his surrender in the first month of the year before last. He often misses his old country, the luxurious life of emperors in those days, and is extremely disgusted with the humiliating prisoner life, so he made this work. This word is Li Yu's masterpiece. According to legend, Li Yu wrote this word and ordered a geisha to play on the night of his Tanabata birthday. Emperor Taizong was so angry that he poisoned him with drugs.