Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 17 - 17-1. Ceremony

Xue Xi is forced to fall in love at first sight with this dangerous man on their first meeting. With death being the only other option, she makes the first move:

The Principality of Atall lies between two great powers: the Kingdom of Allion to the west, and the Holy Dytiann Alliance to the east. Leo Attiel, the second-born prince, was sent to Allion as little more than a hostage, where he studied and trained in the military arts under a frontier general. And now, the times have reached a turning point.

Relations between Allion and Conscon Temple, a neutral land adjoining Atall, have worsened. Percy, sent from Atall as reinforcement; Camus, a warrior monk; and Kuon, a mercenary from a remote region, join forces to resist the looming threat of Allion’s army.

At the centre of the fighting, the three of them and Leo are about to have their fated encounter.

“Y-y-you’re the heir of Reyes Group?” Ian managed to stutter out.

“Yes. And I would prefer no one in Mor Co. figured it out. If I know Marco’s efficiency by the time we get back to the office my appointment as an assistant to the President of Mor Co. will be announced. At the same time all business registrations of Mor Co. will be moved to my name. All the directors will be informed of this but no one else.”

Camilla and Ian nodded in understanding.

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Cedric Reyes has a secret, he is the heir and eldest son of the rich and powerful Reyes clan. As tradition all heirs of their family have to go through a form of poverty training at the age of fifteen. They are left to fend for themselves with no contact and barely any money.

Since leaving, he's gotten married to Adrianna Herandez, the Treasure of the Hernandez clan. Adrianna's family had always looked down at him due to his humble origins, but Adrianna has always stuck by him. Treated badly by his classmates in the past, and his in law in the present. They are about to encounter the shock of their lives.

The Reyes Heir rules the country with his friends, the four princes, who are each from powerful and well respected families.

A decision can destroy the sun, moon and stars. A finger can kill the Heavenly Overlord. While chatting, the Heaven and ten worlds can be annihilated.