John H. Watson (also translated as Watson) is an important figure in The Adventures of Sherlock Holmes by Arthur Conan Doyle, a famous British novelist. In the novel, it appears in the first person. He made his mark in several major Sherlock Holmes cases. The most famous case is the hound mystery in Baskerville. At first, Dr. Sheng Zhonghua was a surgeon. Later, he was unfortunately injured in the Second Afghan War (also known as the "Second Afghan Anti-British War") from 1878 to 1880, and was sent back to Britain to recuperate. In the TV series Sherlock, because the time was set at 2 1 century, Dr. Watson's experience was changed to retiring after being injured in the Afghan war in 2 1 century. Later, under the introduction of a friend named Stanford, I met Sherlock Holmes and experienced future adventures with him.