Ko Tae-Rim (Jin Goo) is a lawyer. He is arrogant and makes biting remarks, but he has a 100% winning rate. He can't even imagine ever losing a case and winning cases is the most important thing to him. His attorney's fee is obscenely high. Meanwhile, Seo Jae-In (Seo Eun-Su) is a gung-ho rookie lawyer. She wants to help clients trapped in unfair situations. Seo Jae-In realizes that lawyers who do not win cases are useless and she decides to work with Ko Tae-Rim.