1. Clues in Di Renjie's life
In Di Renjie's life, the place name "Xiazhang" did not appear, but the acquaintance between Li Yuanfang and Di Renjie began with "Xiazhang". Judging from the clues of TV series, "debt reduction" should be in the time when Turks harassed Hebei in 698 AD. At this point, Di Renjie is 68 years old, approaching his old age. Even if we meet at this time, we won't solve the case many years later. According to the data, in September 670, Di Renjie died of illness. That is to say, even with Li Yuanfang, they won't solve the case together for that long.
2. Di Renjie's bodyguard
If Li Yuanfang is with Di Renjie, there is only one possibility, that is, Di Renjie's bodyguard, but the bodyguard of Di Renjie recorded in history:? Qiao Tai and Ma Rong are both big men, good at fighting and fighting. Qiao Tai served in the army and was familiar with the military. Gan Tao is thin and not good at fighting, but his mind is extremely flexible. He is good at all kinds of "deviant" and is familiar with literary documents. Hong (Hongliang), a native of Di Gong, has been following Di Gong, helping Di Gong with all kinds of documents, and sometimes taking part in handling cases. These people are obviously not as talented as Li Yuanfang. They are familiar with Turks, courageous and resourceful. It can be seen that Li Yuanfang is a fictional person.
3. Detective Dee Renjie is excellent in itself.
Di Renjie is a novel in itself. The essence of the novel comes from the fact that life is higher than life, so it doesn't need facts to refer to it. Li Yuanfang may just be a character and story created by the author on the basis of his life.