The most amusing thing about Di Chens territory is that the family put him in charge and his cousin as advisor and every time he didn't listen to her it bit him in the ass. She is the better ruler but because she is a woman the family made the arrangement that damaged them the most, quite amusing really.
I bet Di Renjie used Teal'c investigation method : Stare right in the eyes of the man for 5 minutes without saying or asking anything while making the most terrifying face.
Nobody can resist and they reveal everything.
scarpa