Jiang Heguang was a hitwoman on the verge of retirement. Why "on the verge"? Because she planned to fake her death and retire. But something went wrong during the fake death, and it became a real one. When she woke up, she found herself the legitimate daughter of a distinguished scholarly family, with just two and a half days before her wedding. But the original owner was consumed by resentment, and her body would suddenly stop obeying her.
Jiang Heguang begged her to just let her die. She didn't particularly want to live in ancient times either, but the original owner seemed to want to die even more. Her soul was in tatters. It turned out that the original owner had already lived one lifetime. In her previous life, she had been deceived and abused by a scumbag. Her one wish in this life was to make sure that scumbag's true love, who was a man and couldn't bear children, would be the one to have his heirs. He wanted to marry her to continue the family line? Fine, she'd have children, just not the scumbag's!
Jiang Heguang said she understood and supported the idea. The original owner replied: Then you go do it!
Who? Me? I don't want to live either.
The original owner's shattered soul explained that yes, she was full of hate, but she was about to disappear. Heaven had given her a chance to return to the world, then sent Jiang Heguang's soul into her body. That meant they were fated to meet, and Jiang Heguang was the only one who could carry out the task.
Jiang Heguang thought it over. Fine. Who would choose death if they could live? After I have the child, this body will be mine, right? Then I can live the life I want!
The original owner: Deal!