In both, the profiler plays an effective role in discovering the truth through the analysis of criminal psychology and examining the role of the environment in criminal behaviour.
In both, the viewer closely observes the criminal's daily life and behaviours.

Both dramas are about crime and criminal investigations. In both viewers can observe the behaviour of criminals.

So as similar as Mistress it's about husband is disappearing and cheating while wife is a strong lady and loyal.

Both deal with the issue of betrayal and both look at it from the perspective of the betrayer and the person who has been betrayed.