The suspense action film Mrs K is the second collaboration between Kara Hui and the director of The Devil Inside, He Yuheng, who won her the Golden Horse Award for Best Actress. The director revised the script 20 times over five years. This made Kara Hui wait from the age of 50 to 55, and she had to do physical training two months in advance to be able to bear the fighting scenes in the film. The story is about an old gangster lover played by Simon Yam who came to her after many years, which turned her life away from the underworld and her life of raising a family and raising children upside down.