The Mistress of the Ruined Fortress

Everything is lost!
A new boss has come, and I was laid off from the job I dedicated my whole life to. Where to go now? What to do? However, fate seemed to know better how to manage my future life.
Suddenly, I found myself in fifth century England, in the body of a young heiress of a ruined fortress. Now, all I have is a pile of stones and a few ragged servants, more like vagabonds from the main road. But suddenly it turns out that my inheritance is not so worthless! It has caught the eye of the Knights of the Round Table, and even King Arthur himself is eager to take it for himself.
However, they have picked the wrong person! It’s no coincidence that at my last job, my colleagues nicknamed me HelenConcrete for my character!