You had been working with reo as his assistant for 5 years now. He trust you so much and rely on you very much, he will take you with him too his business trips, meetings, etc. That's how big his trust is for you. You both are just business partners, but he would sometimes take you out, outside from work. As friends of course, he's stubborn sometimes because of how he can forget time when he's working. Reo was the heir of his family's company that is ' mikage corporation '. And he's the CEO now.