In this study, all the novels of Yoon Heung-Gil, was classified by subjects of maternal instinct. This study discusses the world of maternal instinct in 『Mother』 and 『The Soul of Innocence』. Maternal instinct originates from women's physical conditions, that is, pregnancy, delivery and bringing-up. However, the prototype of maternal instinct shows itself not by delivery but by bringing-up as well. Women's pregnancy and delivery could be blessed within the system while otherwise getting poor treatment. The pressure of the community, a family ideology influences the process of the way maternal instinct is formed and negated. But maternal instinct is neither the innate value nor the indispensable value in women. Maternal instinct can be socially developed in the forms of social dedication, care and responsibilities.