The first episode of “The Double Life of My Billionaire Husband” pans out like a daytime TV melodrama: a female protagonist asks her father and evil stepmother for $50,000 to pay for her mother’s kidney dialysis treatment. Cue an evil stepsister, who snarkily says that the payment is assured—if the lead marries the illegitimate son of a prominent family, who is supposedly a grade-A loser.