My wife likes to go to ktv to sing and come back very late. Let me talk about it. I dare not talk about her when I am angry, but I really don't like her going to those places all the time.

Shouldn't such a wife be strictly disciplined? Are you at ease to go to such a place? Just like you said, if you talk about him, he will get angry, which means something may have happened. If I were you, there would be only two roads and one road. Since he chose to live with you, she should abide by the rules at home. He may like singing. You can buy him a set of equipment at home. Isn't it different to practice at home? Or he likes the atmosphere. You can go with her every time. If he really loves you and really cares about your marriage, I think you can talk it over with him, and he can still accept it. If he still insists on his opinion, I think you should know what is going on.