He chose Earth as his prison for one reason - Her

As princess, her people reviled her for being different. Then came the revolution. Her exile to Earth become an unexpected haven, and now she owns the most decadent nightclub in town and is the reigning queen of extravagance. When the former head of her father's guard strides into her club as arrogant and handsome as ever, she will not allow him to stir-up old insecurities. This princess kneels for no one, no matter how pretty he begs.

Foolish girl, woman-gah! When did the timid, sullen princess turn into a strong, sexy temptress? There is an assassin gunning for her and she needs to focus on her safety, not on enflaming his desires. He made a vow to protect her, and that is a vow he will honor until his death.