Reincarnated as a Dog with System - Chapter 147 - I Am Raising A Gluttonous Pig! Part2

The first thing my childhood sweetheart's did after becoming a wealthy woman was to ask me to marry her, in my poor and destitute state, went to her family to become the son-in-law.“Marry me, and you can live in luxury cars and mansions as you please.No need for work or household choresPlenty of pocket money every day, amounting to a five-figure sumAnd if you want kids, I'll bear as many as you wish.”But when I became this toy boy, I gradually discovered the sickly yandere and perverted control side of my childhood sweetheart...An accident brought me back to the past, live my life again.This time, facing the temptation of childhood sweethearts, I decisively refused!In this new life, my slogan is, drum up the wallet, and stay away from the rich woman!Me: “Sorry, I am the man you can never get in this life no matter how much money you spend!”

Xu Mo, a modern high school student was sent back in time to Jing Kingdom and found herself trapped inside of the body of a princess with the same name.

She had barely recovered when she learned of an unparalleled fiancé and in a daze, they got married. Then the stunning genius physician who normally does not pay attention clamoured to marry her. After that, there was a cold general, a flirtatious lord, a tsundere young master……

As it turns out, this was a male-dominated dynasty. Because the female population was sparse, the entire nation shared wives regardless of rank or nobility. Is it feasible for someone who wants to maintain monogamy in this dynasty?

- Description from Novelupdates

Xia Lian, a 21st century military doctor died in an explosion and found herself transmigrated to the body a 12 year girl. Her mother died and her father abandoned her and her little brother for another woman.

…but it seems pretty doable.