Gao Xiaosong's micro-novel, Eight o'clock Sharp, told a story about time. The protagonist of the story was a young man named Li Lei. He often felt that he did not have enough time, so he decided to invent a time machine that would allow him to go back in time and use the time in the past to complete things that he could not do now. After some hard work, Li Lei finally invented the time machine and returned to 8 o'clock sharp. He found that his mother was cooking at this time, so he decided to go over and help her. However, when he walked into the kitchen, he found that the door was locked. Li Lei thought of an idea. He ran to the living room and called his mother with his mobile phone to tell her that he was going to help her. When his mother heard the news, she was very touched and agreed to his request. So Li Lei went over to help his mother cook. During this process, he met his ex-girlfriend, who also appeared in his life at this time. Li Lei and his ex-girlfriend had a good time chatting. In the end, Li Lei completed the task his mother gave him and returned to the present time. He realized that he was already old, but his mother was still waiting for him. Li Lei felt very guilty because he didn't accompany his mother when she needed him most. Through this story, Gao Xiaosong tells us to cherish time because time is gone forever.