The idiom "Bi Ji" came from Zu Ti, a famous figure in the Southern and Northern Dynasties. Zu Ti was a famous official of the Song Dynasty during the Northern and Southern Dynasties. During his reign, he sent many envoys to the north to fight for more peace for the Song Dynasty. One time, he encountered the rapid flow of the Yellow River in the process of fighting in the south and north, but he did not give up. Instead, he stood firmly by the river and encouraged his soldiers to fight bravely for victory. His bravery and determination were deeply admired by the soldiers and made an important contribution to the Song Dynasty's final victory.