Ancient china BL..it's palace novel MC is ML's wife.. i think is arranged marriage or forced. One scene i remember.. ML is prince.everyone thinks MC is unfavored. in reality ML really like MC but act like he hate him. ML save a woman and act like he fallin in love with her. Only MC know the truth. That woman is spy from another prince and give ML a "gu".. but ML only pretend to fall in trap..
https://www.novelupdates.com/series/the-rich-and-honorable-changan/ Sounds similar, especially the guy part. Was there a scene were the prince broke a tea set a part of a trick? Or did the prince sneak into the MC room at night?