My Traitorous Ex Became a Great Demon

One-line summary: "The ex-boyfriend I failed to kill became a great demon and is looking for me everywhere."

Blurb:

Six hundred years ago, Yun Sheng was ordered to seduce the demon Jiang Congjue and save all living beings.

She deliberately approached Jiang Congjue, tempted him to break his vows, and became his favorite. She fulfilled her mission, successfully destroying his demon core and crippling most of his cultivation.

The price was Jiang Congjue's fury. He wanted to tear her to pieces, bind her soul, and keep her from reincarnating for all eternity.

Fortunately, one of Jiang Congjue's subordinates killed her in a fit of rage. She died quickly, without suffering.

Six hundred years later, Yun Sheng was reborn as a rabbit demon.

She thought: So much has changed over the centuries. The great demon must have fallen from power, and the world must have been remade, right?

Having spent her previous life constantly on edge, Yun Sheng thought she could finally lie flat and live an easy life as an idle little demon.

But when she looked up, demons were running rampant and the Nine Provinces had been united.

The immortal and human clans were cowering in a corner, trembling with fear.

Her old flame, Jiang Congjue, had become the ruler of the Nine Provinces.

The good news: Yun Sheng was alive.

The bad news: Jiang Congjue had been looking for her for six hundred years.

The little rabbit demon had barely stepped out of the mountains when she stumbled into a spirit-catching array and was delivered straight to Jiang Congjue.

Jiang Congjue held grudges and was petty to the extreme.

He wasn't looking for her to reconcile. He wanted to continue the revenge he'd never managed to carry out.

Unfortunately, Yun Sheng's foundation was unstable after being reborn, and she was as fragile as a character with half a health bar.

She had barely arrived at the Demon Palace before her nose started bleeding, and she fainted.

Jiang Congjue sneered. "Treat her first, then kill her. Otherwise, revenge won't be satisfying."

But Yun Sheng was so fragile that she came down with a different illness every few days.

The Jiang Congjue who'd wanted revenge was forced into becoming a rabbit-raising expert.

As he raised her, he ended up taking her to bed.

Later, the demon doctor reported, "My lord, the rabbit demon is in excellent health. You can kill her now."

Jiang Congjue brushed him off. "I'll fatten her up before killing her. She's too thin; there's barely enough meat for a couple of bites."

The Twelve Demons watched with their own eyes as their lord failed to fatten the rabbit demon, but instead fattened her belly.