Twenty years ago, Wang Yuanyang (played by Nick Cheung) was imprisoned for raping and murdering a girl named Yiyun. He was humiliated in prison and turned into a mute killer with a strange personality and feared by everyone. Just released from prison, he was involved in a brutal murder case: the Chinese-British mixed-race conductor Xu Hanlin was found dead in the wilderness by the sea, his face was completely destroyed and his body was covered with wounds. Xu Hanlin was the father of the girl Yiyun. Detective Lin Zhengzhong (played by Simon Yam), nicknamed the Angry Man, was determined to find out the truth. After being released from prison, Wang Yuanyang, who had been following Xu Hanlin's youngest daughter Xu Xue (played by Janice Man), naturally became the biggest suspect. A Hong Kong-wide manhunt was launched. However, the truth has just begun to be revealed.