Seirei Tsukai no Blade Dance - Volume 16, Chapter 4 - Desert Voyage

I never expected my life to change so drastically. One moment, I was a woman with dreams, deeply in love with a man I thought I’d spend my life with. The next, I was betrayed and heartbroken, walking in on him cheating without a hint of remorse.That night, overwhelmed with pain and too much alcohol, I made a reckless decision, a one-night stand with a stranger who, to my shock, turned out to be my new boss.Arec, the vice president of Denco Groups, was desperate. To secure his future as CEO, he needed a wife, and in a twist of fate, he offered me a contract marriage. It sounded absurd, but his desperation mirrored my own need to escape the wreckage of my life.It was supposed to be simple: no emotions, no strings attached. A business arrangement, nothing more. I thought I could handle it, that I could keep my heart out of it.I was wrong.What started as a deal quickly spiraled into something far more complicated. As our fake marriage blurred into real feelings, the world around us began to close in. Disapproving family, old enemies, buried secrets, scheming rivals, and even an attempt on my life threatened to tear us apart.This is my story, a journey of heartbreak, unexpected love, and a fight to protect what we built together. In a world filled with lies and deceit, can a marriage born out of necessity become something real?---

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

Because of his master’s wine, he had somehow become the husband of a cold CEO — I’m still a virgin, please be gentle. He was from an ancient sect and had both Buddhism and Dao cultivation methods. The youth Qin Wu stepped out of the great mountain once again, stirring up the winds and clouds in the city.

- Description from Novelupdates

On the surface, he is the aloof and standoffish patriot whose sole purpose is to serve the nation. On the darker side, he is an invincible, powerful and mysterious man.