Shen Qingge married Gu Yehan, a wealthy man, because his family was in urgent need of huge funds or for some unavoidable reason (involuntarily selling himself, it could be a contract marriage, a ridiculous agreement made by the family elders, or an unexpected encounter where the powerful man (the male protagonist or his elders) noticed his "easiness to control" or "suitable for weddings").
Gu Yehan ignored Shen Qingge and even brought a female companion (perhaps Bai Yueguang's stand-in or deliberately to anger her) to attend the event, making her a laughing stock in the social circle.
He always speculated on her behavior with the utmost malice. He thought her carefully prepared dinner had ulterior motives; her slight concern for him, he thought, was flattery; her normal interactions with the opposite sex, he thought she was unruly.
He may not take action, but his words are extremely mean and insulting, "You are just a decoration I bought with money", "Don't dream about things that don't belong to you", "You are not even worthy of carrying her shoes".
Must see and regret it