Cang shu follows him to the office and tells him that class is over and that the next class will be a self-study class. He tells the professor that he needs to mark the exam papers in the office. He complains that he has to stand there until the end of the school day to do this. He says that the professor gave him this punishment for standing there for so long and that it is okay for him to stand long because he gets good health. Cang cang tells him the correct answers to the exam questions. He is surprised that the answers are different from the ones he had given before. He thinks that he found some errors in the answers. He feels that he is taking himself too seriously and that this is because he has remembered the problem and made some progress. He asks the teacher to go home and stay focused on the exam next time. The teacher tells him to stay focused in the class next time, but Cangshu tells him not to worry, he will catch up with him in another class.