No. Peng Ze and Li are really a pair of fictional characters. They are one of the popular online buzzwords in Chinese mainland. This word comes from a song named Pengze and Li, which describes the love story between a man named Pengze and a woman named Li in a relaxed and humorous way. Although these two characters do not exist in real life, due to the wide spread of songs and the audience's love, this word has become a popular online word, which is often used to describe similar fictional emotional stories or the interaction between netizens.