 Then in 1935, he published a book called The Legends of Greece (希臘神話), which was three to four times thicker than his previous one.After liberation, in the second edition of The Legends of Greece, he introduced Karl Marx's well-known discourse in The Introductory of political and economical criticism (政治經濟批判導言) which was about ancient times mythology to analyze Greek mythology.As the previous newspapers and magazines were banned by the government, Zheng believed that a proper established literature union would make things run easier.