Naruto: The Chosen Undead - Chapter 15 - no. Dark Souls

In the past life, he was an aerodynamic engineer of a well-known company, and in this life, he is a college student of a famous school.

When the two identities are perfectly integrated, what sparks will appear.

His life experience is also slowly uncovering the mystery, whether he can beat the tycoons of this era, and whether he can stand at the peak of world business.

- Description from novelbuddy

WARNING! MATURE AUDIENCES ONLY!!***Casey is a top event planner, planning events for the most elites in the city. She's now tasked with the career-defining job of planning her best friend, Kira's, wedding. However, her life turned upside down when she found out she was falling in love with Jace, her Kira's fiance!Jace is the CEO of Chillz streaming platform, one of the biggest in the country. He's also one of the most dashing bachelors, always on the news and always being hounded by paparazzi. In a desperate move too expand his company, he opted to get married to KIra. But it all changed when he met her best friend, and suddenly, even the future of his company couldn't stop him from wanting to be with her.As passion burns hot and the embers of love is fanned, Jace and Casey try to fight their growing attraction to each other to respect Kira. But with such intense feelings, there is only so much they can do. Will they be able to stay away from each other regardless of the mounting temptations? Or will they throw caution to the winds, finding happiness in each other's arms even while everything they've built and worked hard for goes up in flames?

She is the slow-witted idiot of the Prime Minister’s Residence. Everyone bullies her. He is the most respected and unfeeling Prince, with frightening ability and absolute envy! Together, they are conferred an imperial edict of marriage.

She acts stupid and tries to decline in every way possible while he despotically escorts her into the wedding…… everyone ridicules the match, but no one knows that the “idiot” has transformed from a loser into a talent.

After the marriage, when they encounter the Empress Dowager examining the room, they act in concert with each other and pretend to be two mandarin ducks deeply in love. Afterwards, she laughs, “The performance has ended. Your highness, please return.”

He laughs softly, “Since you’ve got onto this Prince’s bed, don’t even think of getting off.”

- Description from Novelupdates

Ryu Han-bin, the main character who fell into a new world after being chosen as a ‘suitable person’.

Because of the error in the guidelines, the training is repeated endlessly…