The current study aims to examine Korean children and adolescents' understanding of equity in salary allocation, and how this develops with age. In particular, reasoning about unequal salary distribution based on gender and hierarchy is examined in this study, respectively. Methods: Employing a social domain theoretical framework, the current study investigated a total of 60 South Korean children and adolescents' evaluation on gender-and hierarchy-based salary differentials, along with their reasoning for their fairness decisions. Participants were divided into three ages groups of 10-11 years, 12-13 years, and 15-16 years, to compare the age-related change on their evaluations regarding differential salary allocation. Results: Findings revealed that children across age groups considered gender-based salary differentials as morally unfair; however, when salary was differed based on hierarchy (e.g., boss vs. secretary), with age children increasingly judged that the salary differential on position status is acceptable. Conclusion: The current study suggests that as children's thinking becomes more sophisticated with age, they are better able to incorporate diverse societal issues such as hierarchy into their equity decisions, reflecting children's developing conceptions on distributive justice. This study contributes to current understandings regarding Korean children's evaluations of salary inequalities.