This spirit was best interpreted by Guan Yu and Guan Yunchang in the Three Kingdoms period. Liu Bei was defeated by Cao Cao. Guan Yu was forced to surrender to Cao Cao to protect Liu Bei's wife. Cao Cao took good care of Guan Yu and gave him a house, a beautiful woman, a shirt and a BMW. Guan Yu is still indifferent, trying to find out the whereabouts of Liu Bei. Cao Cao deliberately arranged for him to share a room with his sister-in-law, hoping that he would disturb the ceremony of the monarch and the minister. It never occurred to him that he would stay at the door all night with a candle! Zhang Liao asked him why he was in Cao Cao and his heart was in the Han Dynasty. Guan Yu said that he and Liu Bei had sworn to death. How self-love, self-esteem, perseverance and loyalty!