This time round, instead of just directing, he will be guest starring in the movie and even has a daring intimate scene with Shirley, reports Hktopten.
He said, "During the shoot I didn't think of it, after it was done, I remembered that I didn't add a kiss scene! This time I missed out!
He forgot to kiss his co-star, but revealed that he had to take his pants off for the scene.
Shirley will be venturing away from her good girl image, with her portrayal of a mistress in the film.
She said: "This time I play a pretty mistress. I am (Gregory) Wong Chung Hiu's mistress.
"Wilson Chin Kwok Wai is the guy I am cheating on him with. Later, we plot to kill him."