Secret Society: Raising Calamity Class Disciples - Chapter 1 You Know Me, But I Know You More

Going for a swim, she ends up in an ancient wild Beast World and ends up being brought home by a handsome wolf.
She wants to stick to the handsome wolf, stock some salt, farm some land, look at some handsome men and grow old like that, but the handsome wolf pounces on her every day.
What? He wants her to have babies?
NO~ NO~ NO~ There is no happy ending to interspecies marriages, hurry and let go of me handsome wolf~

- Description from Novelupdates

He was able to repeatedly reincarnate due to the effect of the Nine Lives Reincarnation Spell, which allowed him to have nine lives. After defeating the Hell-Blood Demon who drove the entire murim to chaos, the patriarchs of the Seven Great Clans betrayed him and killed him. Following that, he was reincarnated for the ninth time as Baek Mu-Gun. Now, his last journey across murim begins.

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The second prince has come of age. To celebrate the advent of such an occasion, the search for a suitable bride began. My younger sister was expected to go to the Royal Palace as a candidate. However, despite this, she eloped the day before her departure. I, the older sister she left behind, looked almost exactly like her – so much that we were often mistaken for twins…

One month, right? For just one month, shall I substitute in for my sister?

When I became a rich young master, I had to enjoy it.