MTL - A Complete Explanation of the Negative Textbooks of the Imperial Examination - Chapter 19 Buddhist hall

The scum’s or villain’s long road of transformation was tentatively set to the world:
The abandonment of the educated youth’s wife (Completed)
The hidden marriage of the scum film emperor (Completed)
The best brother in the world (Completed)
The Phoenix male who destroy the bridge after crossing the river (Completed)
The treasonous general (Completed)
I’m an honest man (Completed)
To become the top scorer in the School of Agriculture (Completed)
The soft rice man’s self-cultivation (Completed)
The whole world is reborn (Completed)
I want to survive on a desert island (Completed)
The stallion male who has seized the opportunity (Completed)
The perverted self-salvation (Completed)
The spring of the loafer (Completed)
The misplaced life (Completed)
The miser career (Completed)
The ghost is out of feeling (Completed)
The Queen’s favorite husband (Completed)
The vicious girl with her godfather (Completed)
I want to be a good person (Completed)
I does not tear up the family (Completed)
The perverted common plant (Completed)
The Mary Sue’s men (Completed)
Every time I was reborn, someone wants to kill me (Completed)
The old people’s counterattack path (Completed)
The global evolution (Completed)
When I became a net red (Completed)
For you, good person (Completed)
His heart had white moonlight (Completed)

- Description from Novelupdates

Only a pure maiden can have a privilege to make contract with a spirit.

In Areishia Acadamy, maidens from noble family were gathered there, giving them an elite education to become a spirit contractor. A boy Kamito, by accident he peeped on a girl, Clair, who was taking a bath, and he even made a contract with spirit that she wanted.

Kamito was actually an irregular male spirit contractor, which should not exist.

Despite being betrayed by her boyfriend, the neglected heiress Lariette Elsher is still forced to marry him – all because her family wants to appease the fake daughter. The one she was switched at birth with.Screw this! She's done playing nice!Devasted and enraged, Lariette seeks her friend's help – to pick the best man at her butler cafe to be her contracted husband.Enter Ruediger Alvord, infamously known as the poor outcast of the Alvord family, the Elsher's family nemesis. He proposes to be Lariette's partner-in-crime, to wreak havoc in both families.While Lariette is busy getting her revenge, she fails to notice her contracted husband's strange behavior. She also fails to recognize him from a distant past.Before>Ruediger: I have nothing much on my name but, I can be a good househusband.Lariette: It's okay. I can feed you.After>Ruediger: Do you want that house? It's nothing much. Only one billion.Lariette: Aren't you just... a househusband?Since when is her husband a billionaire?!