The preoccupation with human nature is deeply rooted in literature. This paper starts from the ancient Chinese rudimentary understanding of human nature, then passes through Mo Yan’s Frog, an epistolary novel which covers the 30-year history of the Chinese population control policy through the description of an obstetrician in quest of her own human nature, and ends with her mediation and effort to retrieve goodness in the face of state will. Mo Yan, as well as many other Chinese people, does not deny that the onechild family policy had been laid down with a good intention to promote the general welfare of all citizens in China. But through a detailed reading of the novel Frog, it is argued that this policy might be a legalized illegality, ...