In year one of the new school year, cheng hires a new teacher, a man named Mr. Gu, to teach a new subject, "Yingling Genetics." Mr. G is a good-looking man who has published some papers on the subject, but he has refused to sign any contracts with any other schools. He is also a close friend of wang-shen, who is a teacher at the school, and he must have been paid a lot by cheng to come and teach. .