Reborn as an Orphan with a System

Ning Youran, the Second Miss of the Prime Minister's residence, was killed by her younger sister. When she opened her eyes again, she had become a little orphan with neither father nor mother, and had also received a System and a princely heir as her fiancé.

Excerpt:

Wei Zijin sat before the grave, tossing paper money into the fire sheet by sheet. “A revered monk said that if I bury your remains in this life, you will have to marry me in your next life to repay the debt. Ning Youran, you must marry me. So that I can marry you in the next life, I haven't been with a single woman in this one. I'm completely pure. If you marry me in your next life, you'll be getting a bargain. But you have to bear me sons, lots and lots of sons. My Wei family is short of sons.”