In this survey study, we investigate factors that predict the extent of men’s engagement in housework in South Korea. Using data collected from 466 working fathers during the period from March 2013 to August 2013, it was found that a more egalitarian gender ideology and supervisor support for work–family balance were significant predictors of the frequency of men’s participation in housework (i.e., child-rearing activities and household chores), but that long work hours, which are prevalent in South Korea, moderated these relationships. More specifically, the condition of long average work hours reduced the positive effect of an egalitarian gender ideology and a supportive supervisor attitude on the extent of housework. Therefore, we contend that the effects of changes in individuals’ attitudes toward men’s housework will be limited without addressing cultural norms of overwork or "work devotion" in South Korea.