I Thought I Was the Monster Duke’s Fake Sedative

“…Why did I have to end up in this novel?!”

I was transmigrated into a dark, R19 novel where the monstrous Duke—whose dragon blood causes him to go berserk at regular intervals—can only be purified by sharing intimate physical communion with his destined mate.

The problem is the ending.

And

As for me? I’m just an extra, fated to be drained of all my holy power by the Duke’s fake mate until I die.

Accept that fate?

As if!

So I tried to escape…

…only to end up landing right in the arms of the monstrous Duke, who was on the verge of going berserk.

“I’ve come to bring you good news. It seems you still haven’t found the person destined to save you.”

“The person destined to save me?”

“Don’t worry! I’ll help you find your true mate—”

“I was under the impression that my mate had already been decided.”

“My lord, that one is a fake!”

I stubbornly insisted, refused to back down, and ended up traveling alongside the Duke, somehow managing to stay alive.

All that remained was to use my knowledge of the original story to solve the Duke’s berserk episodes and help him find his real mate.

Lucy was confident.

Just as in her previous life, she was sure she could survive this harsh world by clinging to life like a weed—and then make her escape.

…At least, that was the plan.

“You’ve hurt my feelings, Lucy.”

The Duke, who was supposed to find his true mate, curved his lips into a smile.

“As always, the only one who can purify me is you.”

“…”

“But this time, I think I’ll need a proper purification.”

How on earth did things end up like this?!