This study, giving attention to the late marriages of women(the main cause of low birth rate), aims to explore the living world of unmarried womens along with the reason behind late marriages while looking at the main determinants of marriage decisions. Specifically, this study examines not only what single females think of marriage and their value and attitude of family, but also the living world around them, future prospects and expectations of labor environment and one’s occupation, perception on work-family balance, and the order of priority regarding work, marriage,and childbirth.More than half of single women responded that there is no such thing as a marriageable age. But, unmarried women in general are showing positive inclination and attitude toward marriage and childbirth. The reason they are not married yet despite such high inclination of marriage and childbirth can be attributed to their awareness of change in occupational status related to marriage. In other words, more than few single females are mentioning the burdensome nature of giving birth and nurturing while recognizing the difficulty of balancing work-family balance, workplace discrimination, and the pressure of becoming a parent. This explanation is also supported by the logistic regression analysis of the inclination of marriage. That is, for unmarried females, the sense and attitude toward family and marriage, how they perceive of marital resources and work-family balance, and the perception of marital opportunity costs are all affecting the inclination on getting married negatively. This result shows how opportunity costs women have to either give up or be burdened with are making single females be more hesitant of getting married.