The Prince Mistook Someone Else for His Princess, Then Cried Like a Kettle

Marriage first, love later + transmigration + the husband chases his wife to win her back + a clear-eyed heroine Modern-day office worker Chu Zhijin transmigrates to an alternate era. All she wants is to be a wealthy, powerful, carefree widow, so once she confirms that her cousin has no interest in the notorious God of War prince, she happily marries into his estate. Just as she expected, on their wedding night the God of War prince receives orders to go to war, and is gone for three years. Just as she's enjoying herself, her nominal husband returns, bringing the woman he loves with him. Whatever. Men... hmph!