Chasing the Murderer in a Dream

My name is Lin Jianwei. My job is to sneak into other people's nightmares and treat them. My new patient is called Gu Yesan. All the doctors have failed. It was the first time I entered his dream. He didn't show me any nightmares. He showed me a group photo. In the photo, I am six years old and he is nine years old. He calls me "Wei Wei"! I have even forgotten this name...