[Sharp-minded, powerful female general with a scheming streak × frail, delicate young widower who's occasionally just as calculating]
Xie Yu went to the front lines in armor at fifteen. Three years later, she returned to the capital covered in glory and was made a prince.
When she got home, the older sister she hated most had already kicked the bucket. All that remained was her sister's beautiful, frail husband.
Xie Yu: My brother-in-law has had a hard life!
Brother-in-law: I've heard no one can match General Xie's prowess on the battlefield. What a pity I've never seen it. Why don't you come to my room and tell me all about it?