My gorgeous CEO wife

The underworld keeps a ranking of its own powers. First on it is the Dragon Emperor, and second is the man who leads the strongest underground army in the western world. The Dragon Emperor is Arthur. Once he has reached that position he steps away from it, settles his old affairs, and takes a job delivering food to see what an ordinary life is like. Luna is the president of a company. A man abducts her, tries to force himself on her, and beats her when she fights back. She has been drugged. Arthur arrives and gets her away from him, and the two spend the night together. Afterwards Luna believes he used the state she was in, and it is some time before that misunderstanding is cleared up. Her family is pressing her to marry, so Luna proposes to Arthur that they marry straight away. She has money and position and a long line of suitors, and Arthur rides for a delivery service with no car or house and nothing saved, so people laugh at her choice. The family behind a rival group looks down on her and thinks she is trying to attach herself to a bigger group. A man from that family offers her terms: work with him and he will hand her the beauty business. Her company's drug formula has already been stolen. Luna refuses the offer, says her company still has the money to buy the formula again and put it into production, and tells him she will beat his group in open competition. He dismisses her, unaware that Luna is married to the Dragon Emperor and that Arthur has been backing her out of sight, which is why the family's power does not worry her.