It seems the guy had an affair with a Pakistan woman when he was 19, from who he has a daughter, and with he lived with until she was 2 yo. He returned to his home country and never saw her personally again until she knocked at his door one day. His actual wife didn't like the surprise but accepted her in her home. Months later the wife hired a detective, she noticed something with her husband and it didn't took too much to know who was the cause.