Codename-Anastasia - Chapter 37 - 3.7 Contrabass Solo 7

Seo Tae Hyuk, jailed after being falsely accused.

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

Enemies to Lovers? You are at the right place!Liam Von Sylvyran: He is the third prince of the kingdom of Solaryn. He is also the youngest of all siblings. Though he is blessed with magic power, he cannot control this magic power. He has always been humiliated for this flaw and has always been compared with his older siblings. So he has a hunger to prove himself. He is the commander of the royal imperial army of Solaryn. He is one of the best fighters on the continent. It is also notable that he is incredibly intelligent, quick-witted, and has extraordinary beauty.Kian Eryx: He is the commander of Oblivara's imperial army. There is a quote that says that he is blessed by magic itself. He is one of the greatest magic wielders in the three realms. He is the definition of perfection. He has breathtakingly good looks, is incredibly smart, observant, and has extraordinary reflexes. He places top among the best fighters on the continent. There is nothing that he lacks aside from a heart.

You are the ruler, I am a subject, you want loyalty, I’ll give you loyalty. You are the ruler, I am the subject, you want my sacrifice, I will sacrifice for you. This lifetime, we’ll only be ruler and subject…… cannot become the one who accompanies you to experience everything.

A deposed empress, a failure of a substitute. Charging into battle, he was the emperor, and she, his general. But within the intimacy of their military tent, he was her husband, and she, his wife.

But everything was star-crossed. For the one he loved the most, he would push her into hell again and again.

- Description from Novelupdates