Matt Yeung (楊明) and Sisley Choi (蔡思貝) played police officers in new film, PTU 2019 (機動部隊2019) and tried the pepper spray personally during the shooting. On 5th May 2019, Matt shared photo of himself closing his eyes and testing the pepper spray with the help from Max Cheung (張達倫) at the drama set. He washed his eyes immediately and it was hard not to show the pain. He left a message: “It resembles to more than 10 pepper bottles spraying towards me and is hard to stand it. I still have to read the words in the banner thereafter and it is indeed an unforgettable experience.”