Kang Da-Wit is an ambitious judge on the right track. Thanks to his impeccable work and polished image, he's an influential figure in the legal world and has hundreds of thousands of followers on social media. An unexpected event forces him to resign. He decides to work as a public-sector lawyer for a nonprofit organization called Pro Bono. There, he meets Park Gi-Ppeum, a public-sector lawyer. She's a legal nerd who likes to dig deep when she becomes interested in something. She believes a lawyer's mission is to protect human rights and promote social justice.