In idioms, "don't" means parting and parting. Specifically, it originated in China during the Warring States Period (475 BC to 22 BC1year). It tells the story that Xiang Yu, a general of Qin State, met his lover and famous Chu opera actor Yu Ji after he captured Ying, the capital of Chu State (now Jiangling, Hubei Province). Xiang Yu wanted to bring her back to Qin, but she didn't want to leave her hometown and career, so she finally chose to stay. When the two sides parted, Xiang Yu cried and sang two songs, Long song and Whitehead Song, expressing her love and endless thoughts.
Details and historical allusions can refer to ancient history books, such as Historical Records.