Early in the story, Leung Pak-yeen (Damian Lau) was in a battle with his wife (Mary Hon) and they argued on a building rooftop. The wife fell from the building top and the murder was witnessed by one of the construction workers. The worker turned out to be an illegal immigrant in Hong Kong. He spent a great deal of time escaping Leung Pak-yeen and just about anyone who questioned his identity.
Soon the daughter of Leung Pak-yeen, Ceci (Niki Chow), spotted a newspaper with the construction worker. She attempted to track him down and failed numerous times. Upon cleaning up her dead mother's house, she discovered a diary written before her death. The book content was told as part of a flashback, which spoke about Leung Pak-yeen's true past. Apparently he went to mainland China to do illegal trafficking a long time ago for his business. He set up and sold out one of his partners to gain a bigger share of the trafficking profit. His partner was killed under the custody of the mainland police, and never made it out alive.
Ken (Kevin Cheng), the son of the partner, grew up thinking his father was just neglecting him. His girlfriend, Ceci, warned him about her findings in the diary including her father's murder acts and motives. Ken soon realized his father did not neglect him when he was a child. Instead his father was set up by Leung Pak-yeen during the trafficking and killed. Both of them were motivated to track down the construction worker who witnessed at least one of the crimes.
Ken, Ceci, the construction worker would all end up in Hong Kong's High court in an attempt to put Leung Pak-yeen behind bars. Under oath, the construction worker would testify. Because of his poor credibility as an illegal immigrant and weak testimony going up against a top notch lawyer, the case was lost. The father who was essentially responsible for the murder of two people earlier was now set free.
The story then shifted to the young couple with Ken and Ceci trying to put the event be
