The graph aggregates women who entered the workforce in different years. It sums up the participation rates of different cohorts and does not necessarily tell the story of women dropping off after marriage.
In this narrow perspective at least, it shows that we have been making slow progress. BUT...
(Note: All charts so far from @KRInstitute State of Households 2018)
Our tertiary education enrollment rate, i.e., students enrolled in tertiary education as a proportion of population of the tertiary education age, has been steadily increasingly. It was ~5% in 1980. In 2017, it's above 40%.
The latter, especially, needs more attention.