The growth of non-standard work since the Asian financial crisis of 1997 has emerged as the central political concern in South Korea. Important legislative interventions, the Non-standard Employment Protection Acts, were introduced in 2007 to protect workers from insecurity and precarity. This article investigates the effects of the Acts on women workers by comparing the employment characteristics before and after the introduction of the law. The Acts reduced the proportion of non-standard employment to a certain degree, but employers continued discriminatory practices against women workers and aggressively took advantage of more precarious forms of non-standard work. Due to severe sex segregation in the dualistic labour market, more surreptitious forms of discrimination against women workers remained intact. The results of this study point to the fact that social protection for non-standard work and more egalitarian gender relations in the labour market require a new paradigm of social rights.