Jang Hye-sung (Lee Bo-young) is a bold, sassy, thick-faced, comical female lawyer. She is a prickly edge, sharp tongue who doesn't have a bit of concept or manners and finds it hard to be enthusiastic about what she does. Cha Kwan-woo (Yoon Sang-hyun) is a serious, passionate and macho former police officer who becomes a government lawyer. Meanwhile, Park Soo-ha (Lee Jong-suk) is a 19 year old boy who has the superpower to hear people's thoughts. Together they will team up to solve the cases no one else wants, cases that only have a one percent chance of being found innocent.
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