Thirty years ago, hardened criminal Yip Siu-tin is arrested for armed robbery and sentenced to prison. Siu-tin’s daughter, who has handled the loot, changes her name to Cheung Sum-yuet and starts a new life. She also gets married to yacht company boss Yen Ho-yin. Meanwhile, Chong Chi-kiu is a kid left behind by an accomplice who has died because of the robbery. Kind-hearted Tang Sing-him becomes his foster parent. A traffic accident causes Chi-kiu and Sum-yuet to run into each other again. But this accident somehow has something to do with Siu-tin, who is just released from prison. Sum-yuet can no longer avoid Siu-tin, who is a nightmare to her. Her marriage also has certain issues. Police officer Yeung Yan-hiu intervenes by launching an investigation, and she keeps going after Siu-tin and Chi-kiu. Unresolved grudges for thirty years are again put on the front burner. Everyone implicated in a robbery of yesteryear is drawn into this mess.

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.