What is the story of shadow in solitude?

I can say that this story surely happens in real life. And I am criticizing those married couples that were cheating on their partners. And the worst part is having an affair with the sister of your wife is the most awful thing you'll ever do.

So all I can say is that if your going to enter into a married life you must think it twice. According to a Filipino Proverbs " Ang Pag-aasawa ay hindi parang kaninng isususbo na iluluwa kapag napaso". it just mean that entering into a married life it must be decided twice so that in the end you are not going to commit such bad things that will result in something you'll never thought, like DEATH.