Attached below is the sentimental story between Mr. Bai Juyi and his first love, maybe the only love, Xiangling(湘靈) 

如果沒有這個女子，白居易寫不出經典的長恨歌！ - 每日頭條 (kknews.cc)   

PS: I have translated his two of many poems written for Xiangling in my previous writings, as attached below:

試譯 白居易 鄰女 - kkuo0810的部落格 - udn部落格

試譯 白居易 夜雨 - kkuo0810的部落格 - udn部落格