But later generations praised "Bai Yuan" more, because they were not only equally famous in writing, but also very affectionate.
In the 10th year of Yuanhe in Tang Xianzong, Bai Juyi and Yuan Zhen were demoted at the same time, and Yuan Zhen was seriously ill. They miss each other, write poems and tell each other about their thoughts, which is a much-told story in the literary world. You can look for it if you are interested.
The high school textbook "The Book of Harmony" was also written by Bai Juyi to Yuan Zhen to report his safety. It's elegant and worth reading.