鄭嘉穎
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.