Chen Yu speculates that the murderer’s motive for killing Fiona was revenge and that they are likely to have known each other. Zhijie concurs. Lantian notes that the time Don went missing is close to that of Fiona’s death. An SD card is found at the crime scene. It contains a photo of a warship model. Chen Yu is told to investigate. Zhijie shows her team the photo of Don, whom they suspect is the killer. Chen Yu recognises him as Xuewei’s friend. Hongxi did not attend school. Questioned by Zhijie and Lantian, she confesses that she is being shunned by her classmates and blackmailed by Will. She files a police report and reveals to Shishi that Will has the nude photos of two other girls. An arrest warrant is issued for Don. Xuanmei remembers him is A-kun’s friend. Lantian and Jingze and their team storm A-kun’s house, uncover Don’s trail, and arrest him and A-kun. Don declares he is the only person behind the scams in both Taiwan and Singapore. He denies killing Fiona. Both Lantian and Zhijie think he is keeping something from them. Shishi finds the other female victim blackmailed by Will. She reveals Will has an inflamed finger. Shishi is looking for another place to move into. She is elated when Yanqi invites her to stay at her place. Yanqi is now a volunteer police officer. Chen Yu tells Shishi an inflamed finger could be the occupational hazard of people working in restaurants, salons, or car wash outlets. The police locate the salon where Will works. He flees when he notices the policemen arriving. Will demands money from Hongxi. They go to the ATM, and she tries to send a help message secretly. He catches her doing so.
