Chen Hongzhi was involved in a car accident as a teenager. The accident caused him massive brain injuries that left him with a five-minute memory. In order to have a somewhat normal life, the man writes in a notebook everything that happens during the day, from people he meets on the street to the weather forecast. He is helped by his mother, who reminds him every day how many years have passed since the car accident and gives him his notebook to read who his friends are and what he has to do. The condition affected his ability to write properly and Chen developed his own language that no one else can understand.