Cyber Security and Technology Crime Bureau Senior Inspector Szeto Chung (Mat Yeung) is a mentor to and also a friend of Inspector Siu Mei-ting (Hera Chan) in the workplace. They have unraveled all kinds of phone, online and tech scams. While Szeto Chung is investigating an online dating case, he runs into his ex-girlfriend Cheung Wai (Samantha Ko) again. Love between Szeto Chung and Cheung Wai is rekindled as Cheung Wai happens to have broken up with her husband Shum Chi-ho (Stephen Wong). And then Mei-ting feels perturbed as she has mistakenly caused her family members to fall for a money scam. Fortunately, with Szeto Chung's encouragement, she picks herself up and starts from scratch. Meanwhile, London Gold fraud is causing havoc in the city. Danger is lurking everywhere as Chi-ho and Cheung Wai are also involved. These scams are actually under the control of some powerful syndicate. The mastermind is also some crook who has scammed Mei-ting's family members. Szeto Chung and Mei-ting have formed an alliance that is determined to bring the scammers to justice.