Paap Punyo (Vice and Virtue) simply means 'the bad and the good'. But, In one place what is considered as bad can be considered as good in another place. So, defining this, is not that straight forward. Khorshed, the president prize winner local chairman, also didn't manage to define the thin line between the vice and virtue in his life.
As the story progresses, he confronts an undiscovered relationship with his housemaid's son Al-Amin that puts him in the middle of the dilemma of what is Paap (Vice) & what is Punyo (Virtue).