The plot of A Guilty Conscience is a bit unrealistic at times. For example, it is hard to believe that a single mother would be able to afford a top-notch defense attorney, especially in Hong Kong, where the cost of living is so high. Additionally, the way that the attorney is able to uncover the truth about the woman's innocence is a bit too convenient.
Here are some specific examples of the unrealistic plot:
The single mother is able to afford a top-notch defense attorney, even though she is not wealthy.
The attorney is able to uncover the truth about the woman's innocence in a very short amount of time.
The police are not able to find any evidence that the woman is guilty.