Hi, Edison, it seemed should be about the difference between "おっと（夫）"and"しゅじん（主人）"? Basiclly, both of them means 'husband'.I think compared with"おっと（夫）", "しゅじん（主人）"is just a honorific. They used in different situation. 主人（しゅじん）＝my husband. Talking about own husband to other people formally △私の主人は中国人です。-My husband is a Chinese. （introduce own husband to co-worker or boss） ご主人=your husband. Talking about listener's husband by showing respect △ご主人は中国人ですか。-Is your husband a Chinese? おっと: it's a neutral word.I think it's easier than しゅじんto use.Because you don't need to think if or not it should be added "ご" ahead. △私の夫（おっと）は中国人です。 △あなたの夫は中国人ですか。