Former Hong Kong Correctional Services personnel Cheung Sing-hei was sent to prison for murdering his stepfather. The key witness of the case turns out to be his cousin and best friend Tong Lap-yin. Ten years later, Sing-hei is released from prison. Lap-yin is now one of the most influential people in the city while Sing-heis reputation and future are in ruins. Feeling extremely frustrated and harbouring suspicions about the case ten years ago, he is desperate to find out the truth behind his stepfathers death.