"Write a couplet about the Three Kingdoms."

During the Three Kingdoms period, Cao Cao, Liu Bei, and Sun Quan were fighting for the throne. Therefore, someone wrote a couplet to describe the theme of this historical period: First verse: Cao Cao cut off his beard and abandoned his robe. He was defeated at Red Cliff and fought against Lu Bu. The second line: Liu Bei occupied Shu and became the hero. Guan Yu lost his righteousness and Kong Ming did his best. The couplet analyzed the life stories of the three leaders of the Three Kingdoms period, emphasizing the complex relationship between war, loyalty and fate, and showing the theme and atmosphere of that era.