in the modern age, the need for marriage has disappeared, and the sense that marriage is not necessary has spread. marriage and child care have changed from necessity to choice. and, socially, it can talk about the decreasing birth rate due to late marriage or not getting married, the personal burden of marriage and child care is lifted, the depression is brought, the suicide rate is increased, and the consequent acceleration of an aging society and the absence of a generation responsible for the welfare of the elderly.