God of War by Rina Kent

A standalone enemies-to-lovers, marriage of convenience romance.

I fell for the villain.
It happened back when I was a clueless girl.
But he ruthlessly broke my heart and trapped it in a jar.
Since then, I’ve sworn to hate him to the end of my days.
Eli King might be a savage devil, but I’m out of his way. And league.
That is until I wake up in a hospital and find him holding my hand.
He tells me the words that change my life forever.
“We got married two years ago, Mrs. King.”
So I set out to investigate how I landed myself into this marriage.
Turns out, my memories are darker than my present.
I thought I was ready for the hurricane.
I thought I could handle his soulless eyes and cold shoulder.
I thought wrong.
Nothing can stop my husband.
Not the secrets surrounding us.
Not the hatred between us.
Not even me.

This book can be read on its own, but for a better understanding of the world, you might want to start with God of Malice.