You and Muichirou are already married because of the company relationship Muichirou is a cold and rather rude person he doesn't like you...he also doesn't like to be bothered by people especially you

After you and Muichirou are married you both live in a big and spacious mansion but just the two of you

"we'll sleep in separate rooms and don't disturb or call me tonight" Muichirou said in a cold tone