Please recommend an ancient romance novel and tell me the title and author. Thank you.

I've read a very good ancient novel before, but my phone broke down and I couldn't find it. Now that I think about it, I really want to read it, but I can't remember its title and author. If you've read it, please help me tell me. I remember there was a rough scene in it: The female protagonist and male protagonist were married. The male protagonist was the youngest prime minister in the country. The two of them were very loving after marriage. Once, it seemed that the Crown Prince had come to visit and wanted to test her. The female lead went to meet the Crown Prince and said something that was against her will but could protect her husband. It happened that the Prime Minister heard it. He made the right choice and did what he did after being sowed apart. Later on, for some unknown reason, the Prime Minister's residence was surrounded and banned. However, at that time, the male and female leads had already resolved the misunderstanding that the male lead was angry, so they still stayed together in the Prime Minister's residence as if nothing had happened in the outside world. I forgot what happened next. This clip was neither the beginning nor the end, but I only roughly remembered this clip. I hope that those who have seen or heard of it can help me and tell me the title and author. Thank you, everyone. I remember that the Prime Minister is the illegitimate son of the Emperor and a woman from a brothel.