What is the friendship between Li Bai and Du Fu?

During the Kaiyuan period, Li Bai came to Luoyang, where he met Du Fu, who was 1 1 year younger than him. The poet fell in love with the poet at first sight and forged a lifelong friendship. Although they will meet again in the future, their friendship will last forever, leaving many touching poems and becoming legendary stories in the history of China literature.