It is said that at the end of the Eastern Han Dynasty, Cao Cao defeated Liu Bei in Xuzhou, and Liu Bei was separated from his righteous brothers Guan Yu and Zhang Fei. In order to protect his two sisters-in-law, Guan Yu had to agree to three conditions to surrender to Cao Cao. Cao Cao envied Guan Yu's loyalty and courage, and rewarded famous horses, beautiful women and gold and silk many times, hoping to win Guan Yu's return. Guan Yu was unmoved. Cao Cao ordered the story of Diusim to seduce him on a moonlit night, but Guan Yu scolded him righteously and killed himself.