Within the project �Issue Paper Series � Labour and Society�, the Friedrich-Ebert-Stiftung Korea Office has invited national experts to analyse the current trend of socio-economic issues in South Korea and developing future scenarios for �socio-economic justice transition�. This article attempts to answer the following questions about non-regular workers in South Korea: - What can be understood as �non-regular workers� in South Korea? - What are the main characteristics and problems of non-regular workers in South Korea? - Are there any well-known example(s) for organising efforts of trade unions in this field? Are there any alternative format(s)? - How can the legal framework, governmental regulations and legal initiatives for non-regular workers be shaped in a more progressive way?