and Apple's friend. She tried to leave with Apple after seeing that Wilson was going to get her killed by making her eat so much drugs. But both Apple and Wilson pushed her away and told her to leave by herself if she wanted to. Eventually, she left in a rage, accidentally taking away the empty pill bottle that Wilson used to shove drugs down Apple's throat. She was the only eyewitness to Wilson shoving a bottle of pills down Apple's throat. Hugo Wong as Benny Chan Cheuk Wah (陳卓華), Wilson Yu's assistant. He took up the blame for Wilson's idea to kidnap Baby so that she wouldn't be able to testify in court. Simon Lo as Wong Shek-on (王頌安), a hotel custodian worker. He witnessed Apple trying to escape from Wilson before she died. The next morning, he thought that Apple was asleep so he decided to steal a valuable watch that Wilson left behind. Case 5 (Episode 13 - 16) Lui Hei as Wu Sai-hang (胡世恆), nicknamed Bus Brother (巴士阿哥). He is a University computer science student, who excels in computer science but lacks social skills. He became infamous for his social problems after a video of him being unable to stand up for himself against an unreasonable woman was posted on the Internet. He was also accused of being a pervert by putting a secret camera in the female toilet. A few days later, his dead body was found in a compost bin which attracted many flies at the University. Ko Hor-wai as Wu Lok-shan (胡樂珊), Wu Sai-hang's younger sister. Ma Koon-tung as Chiu King-Pui, Peter (趙敬培), Wu Sai-hang's roommate, who was one of Wu's only friends. They were both computer geeks and he did IT business with Wu. When Wu wanted to break off their business relationship because he knew he was the dominant party and needed money urgently to pay for his father's medical fees as the sole breadwinner of his family, this angered Peter because he thought that Christy put him up to that lie. He tried to convince him but they got into a fight and he ended up killing Wu. After his confession, he realized that Sai-hang didn't lie about his father sickness and not only hurting his father after uploading the social video also Sai-hang's family and himself. Brian Chu as Yau Chun-kit, Simon (游俊傑), Yau Kin-Po's son and medical student.