Since losing his eyesight in an accident, Man Sun-Hop has been continually harassed and despised. But instead, his determination and perseverance are so reinforced that he has qualified as a barrister. He has also developed an acute sense beyond sight which helps him to gain the status of Blind Legal Knight in the legal profession. However, nobody really knows his true character. Fortunately, Kuk Yat-Ha, his flatmate and private detective, and ChiuChing-Mui, female legal executive with mob connections, are two buddies he can always rely on. The trio are known as Three Sword Fighters who never submit to power and are always ready to seek justice for the underprivileged. Sun-Hop’s provocative style has aroused the fancy of female judge Wong Lai-Fan, who cannot control her amorous feelings for him. Expanded to a quartet, their fate encounters turbulent changes while handling challenging legal cases. Reappearance of Sun-Hop’s father and Tai Tin-Yan, fellow sister from college, further complicates the situation, which Sun-Hop may not be able to unravel with his legal mastery.

During Emperor Renzong's reign in the Song Dynasty, Bao Zheng is appointed Kaifeng Prefecture Prefect. Bao Zheng, his trusted aide Gongsun Ce, Guard Zhan Zhao, and the four Constables are determined to crack down on corrupt dealings. Merchant's daughter Yun Qianyu is an eloquent speaker. Under Gongsun Ce's guaidance, she eventually becomes a consel. Ji Niannian, a maid from Gaochang, is an autopsy expert. These two ladies help Kaifeng Seven unravel bewildering cases. However, danger is lurking everywhere in Kaifeng Prefecture. When it is revealed that the emperor's heritage is questionable, Bao Zheng has to handle the most difficult case yet as he faces the dilemma of revealing the truth or abandoning his conscience for the sake of his country.