Ame no Hi no Iris - Chapter 4 - Letters Part 4

A lost soul from Earth transmigrates to a world of cultivation and finds himself in the body of a playboy noble and complete waste. Except he doesn't have any memories, can't let anyone know he's not the same person and is immediately involved in a conspiracy with a powerful noble family.Luckily he came to this world with a power, whatever he gives to someone as a gift he'll get it back 100 times better.His first target?His new wife, the former top young genius.

She is a two-faced and fierce hidden ghost doctor,

Before crossing, she was despised by everyone and is widely known as a “waste”.

The contract of the ancient spirit,

The cultivation speed that rivals the gods,

She will show everyone just how blind they are.

With poisonous powder in her hand, who dares to bully her people! they are looking for death!

What Ninth grade medicine pellet? Her adorable pet eats them like a jelly bean.

He’s so capricious! He who is always coquettish at her named as the “Night Prince”, everyone thought he was cold and indifferent, but why in her eyes he was so difficult, haunting.

“Why are you staring at me like that?”

“I wonder when you will become my woman.”

A fine needle was pressed against his waist, she laughed

“Prince, you keep urging this devil, if this poison really goes in you, you can only be a eunuch in this life!”

- Description from Novelupdates

A human from Earth is thrust into the [Hunter x Hunter] world, becoming the Zoldyck family’s defiant, red-eyed prodigy. They call me a genius and the rightful heir, but I say that’s Killua’s burden to bear.Armed with crimson eyes, and a subtle yet powerful system, I’ll rewrite destiny, upend the world, and embrace the chaos with a wicked grin.

Varian only wanted to end the war with the Abyssals and bring peace so that no one would lose their dad like he did.