I Have a Military Shop Tab in Fantasy World - Chapter 132: Graduation Part 1

She, a modern hidden ghost leader of an organization which gathered insane prodigies proficient in the various differing skill-sets. Highly skilled in medicine and poison, executes covert assassinations, viewed as insane and demonic in the eyes of people of the world. Killed in an accident, and reborn into the body of a disfigured young girl.

What? Face disfigured, identity stolen? A return to the family dim and hopeless? Her identity can be given up, her family can be forgone, but as for the one who harmed her predecessor who inhabited this same body, if she didn’t at least make them scream in unimaginable agony and throw them into a state of wretchedness, how could she live up to her demonic reputation? Endless turmoil ensues and it’s a battle to dominate over all! See how she shook the world dressed in a suit of red, her sword up against the dominant powers that rocked the Heavens! Her name spread across the seas, shocking the earth!

- Description from Novelupdates

Despite being betrayed by her boyfriend, the neglected heiress Lariette Elsher is still forced to marry him – all because her family wants to appease the fake daughter. The one she was switched at birth with.Screw this! She's done playing nice!Devasted and enraged, Lariette seeks her friend's help – to pick the best man at her butler cafe to be her contracted husband.Enter Ruediger Alvord, infamously known as the poor outcast of the Alvord family, the Elsher's family nemesis. He proposes to be Lariette's partner-in-crime, to wreak havoc in both families.While Lariette is busy getting her revenge, she fails to notice her contracted husband's strange behavior. She also fails to recognize him from a distant past.Before>Ruediger: I have nothing much on my name but, I can be a good househusband.Lariette: It's okay. I can feed you.After>Ruediger: Do you want that house? It's nothing much. Only one billion.Lariette: Aren't you just... a househusband?Since when is her husband a billionaire?!

As a virtuous wife, does it include tolerating his cousin, enduring his concubines, bearing his mother?

If you will not let me live freely, why would I let you live in satisfaction?

Did fate let women time-travel so she could learn the three morals and four virtues?

Rather than act like a coward and live, it would be better to live in satisfaction and die.

- Description from Novelupdates

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.