Jang Hye Sung and Cha Kwan Woo are court-appointed public defenders tasked with representing defendants whose probability of innocence is less than 1%. She has a strong-willed and outspoken personality and doesn’t mince her words; he is a former police officer, macho and swaggering. Park Soo Ha, on the other hand, is a young man with the ability to read other people’s minds – a mysteriously intriguing character who will lend the protagonist a hand in solving her cases.