The director still asks Sum Yu to cry on cue. She can actually generate tears that are larger than a 10 cent coin. A closer look reveals that Sum Yu's contact lenses have fallen out. Those who practice it can change their faces as the days go back. For those who succeeds in honing the skill it can even help their stardom.
Face change is divided into two levels.
The best example is Rosemary. Who would have known. To search for perfection as an artist, one sometimes would exhaust all revenues to rid one of facial flaws. Some might even resort to plastic surgery. Double eyelids besides being the symbol of beauty seemingly has something to do with luck as well.