WAI tells SUM she and KEI are half sisters when he asks her about her relationship with KEI. Three years ago, KEI told WAI when they were chatting online that HIN had raped her. WAI encouraged her to report the case to the police. Unfortunately, KEI was knocked down by a car later and died. SUM interrogates HIN at his house. Before he leaves, he points out there is something strange about FUN’s behavior. SUM and HAN watch the TV together. HAN tells him FUN was very popular among men in the early days and that KWAN was one of her boyfriends. SUM and TING go to a scrap yard to look for KWAN. HAN sees SUM staring at a photo of him and his father. Something suddenly clicks which is crucial to the case when he is chatting with HAN. HIN, FUN and KWAN have been taken to the police station. SUM arranges them to testify in the same investigation room, where HIN loses his temper and points his fingers at KWAN…