The content of a paper written by Professor Xu is very mysterious, which should reveal the secrets of some important people, so the content of the paper is not revealed in the play.

At first, Piao Chang-hao was entrusted by the mayor to investigate the authenticity of the newspaper, so he was framed as a mouse by a mysterious man and went to prison. After her husband was imprisoned, Gao came to work in the hospital where Professor Xu worked before his death, just to find out the whereabouts of the paper.

Han's wife was abused by him all the year round and finally betrayed Professor Xu. She is the lover who often goes fishing with Professor Xu by the lake. Professor Xu gave her the necklace with the paper hidden before he died. It seems that she didn't know there was a chip in the necklace at first, and it was not until Professor Xu was killed that she discovered the secret of the paper.