One suspects writer-director Carol Lai may have harboured some Black Swan ambitions with a tale that also centers around a stage practitioner who embarks on an unwitting destructive journey when playing a role to die for. The Second Woman, whose Chinese title Romance Riddle may hold better clues as to how this film developed, being more of a guessing game that threw constant clues rather than a overly romantic film about twins falling in love with a man who decided it's perfectly OK to string both women along, until he discovers that this spells double trouble.

Lin Yi and her boyfriend Sun Wei is in full swing developing underground affair but this time, the police suddenly came to the home of Lin Yi Sun Wei told he had died a long time; Chen lived on the floor every night lights appear the same frequency, but with her ​​every night lights conversation boys and another girl seemed to have a secret can not be said; Liu Yihao often saw the woman on the floor, screaming for help, but when he informed the police to rescue them when they surprisingly found that the room was empty ...... all of this What is hidden behind a secret? They encounter bizarre experience, even under threat of death, for they reveal the truth at all costs.

A world-class hitman ends up swapping identities with a down-to-luck extra actor during an accident.