Public interest lawyering in South Korea has emerged as a response to inadequate rights protections. During the democratic transition, Lawyers for a Democratic Society (Minbyeon) was the primary network of lawyers who advocated for civil and political rights, especially on behalf of workers, students, and dissidents. In the 1990s, lawyers increasingly worked with nongovernmental organizations to promote social and economic rights in the areas of labor, consumer advocacy, environmental rights, and gender equality. Most recently, a small number of public interest lawyers’ groups formed to focus on the rights of minorities, such as migrants, refugees, people with disabilities, and sexual minorities. Meanwhile, bar associations, law firms, and law schools have sought to promote pro bono activity as a professional ethic. This article examines the emergence of public interest law entities since the early 2000s to identify patterns in institutional development and sustainability, especially in modeling and diversification. These case studies uncover an increasingly institutionalized infrastructure for legal mobilization in Korea.