This study examines the impacts of immigration policies adopted by the Korean government, vis‐a‐vis other economic, social, demographic, and political factors, on labour migration from developing countries to South Korea using a modified gravity model. The model is extended to marriage‐related migrants to gain insights on marriage migration. The positive results in three out of the five immigration policies examined affirm that liberal policies are associated with increased migration, especially for preferred groups like ethnic Koreans, marriage migrants, and professionals. The positive effects of “push” factors such as population, unemployment, and inflation are generally similar to their effects on migration to the US, Canada, Germany, and the UK despite its more rapid transition from a migrant‐sending into a migrant‐receiving country. Political terror's non‐significance may be due to South Korea's limited asylum policy. Finally, the results of the extended model imply that marriage migration share plenty of similarities with labour migration.