More women than men are taking up low-paid jobs, with 43 percent of all females in the domestic workforce now ranking as non-regular workers, compared to just 28 percent of their male counterparts.

Interestingly, women under 25 get paid more than men on average, but the reverse is true when they get older.

"For women aged 35 and older, their income falls far below that of men. What this shows is that many women leave their jobs to have or take care of kids while in their mid-30s. Some don't return to the labor market at all. Others do return, but to lower-paying jobs," said Kim Young-ock, a researcher at the Korean Women's Development Institute.