Louis Koo (古天樂) and Jessica Hsuan (宣萱) are considered old filming partners and accepted an interview for their new film, A Witness out of the Blue (犯罪現場) a few days ago. When asked if both felt their acting skills had improved since working together after more than 10 years, Louis replied he had different perspectives about his role characters since growing older and becoming mature. He expressed his desire to film a love movie with Jessica in the future as they had little scenes this time. Jessica then praised Louis was a calm man and could wrap up the scene within one take: “He can do it in the past and can cry immediately in a relationship scene too.”
In the film, Louis wanted to kill Jessica and her neck was injured, but she did not request to seek treatment at the hospital in order not to delay the filming progress. He revealed it was not his first time to hit woman and treat Korean actress as a man when shooting Line Walker (使徒行者) movie.