In the Second Generation of the Trench, He Changed To the Ruanfan Script - Chapter 72:

This is the story of a crazy lich who possesses an internal game system and brings catastrophe to the entire world.

After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?

Having the capability to destroy humans, elementals, and gods, after a long period of countless wars and strife, Arnos the demon lord became sick and tired of all that and longed for a peaceful world, so he decided to reincarnate to the future.

However, what awaited him after his reincarnation is a world too used to peace that his descendants became too weak due to a huge weakening in magical powers.

Arnos enrolled in the Maou Academy established to find any students that might be the demon lord’s reincarnation, but his powers are too extraordinary that those in the academy couldn’t properly judge his powers, so he’s regarded as an “Inept student”. Being underestimated and avoided by most people there, he recruited a girl friendly to him, Misha, as his subordinate and comrade, and strives to climb to the top of the demon race hierarchy to one day reclaim his former title and status.

Xia Zhijun got the title ‘study god’ after scoring first place in the whole city. He’s the model of a good student in a teacher’s eyes: good grades, good manners, and quiet. When he wasn’t smiling, his entire body emits a cold abstinence aura. The girls only have the guts to look from afar and not get close.
Later, it was rumored throughout the entire school that even the study god would fight and hit on girls. Whoever dared to provoke his girl, he would teach you how to be a person at every minute. The night of the graduation ceremony someone saw him blocking Gu Siyi in the corner. He didn’t stop kissing even when she cried. He bit her lips and said in a raspy voice, “I’m going crazy…”
During college finals, Gu Siyi almost bursted out crying, “I’m such a failure. I won’t be able to find a good job in the future…And if I can’t find a good job, I can’t provide for myself…”
Xia Zhijun played with her pink earlobe and remarked, “I’ll take care of you.”
After they graduated, Xia Zhijun created a research company and Gu Siyi became the boss’s wife.
The commercial rocket, “Star of Siyi” was successfully launched. So everyone knew that the new technology superstar, Xia Zhijun has a wife who he spoils a lot.

- Description from Novelupdates

Kizy, an etheral beauty with a cold but proud personality.

She had infuriated her boss and left the previous company. In return, the company attacks her mom. Plus with the power behind the company, no hospital is ready to treat her mom.

Thus left with no option, Kizy had to go and plead Markus for saving her mom.

Markus, most eligible bachelor in country B with a godly handsome face. He is no.1 business tycoon. But only a few people know that Markus is actually the current mafia leader of underworld in country B.

And unknown to others, he has a past with Kizy. To put it in plain words, they both can be called sworn enemies. They have known each other since childhood and hate ech other to the core. Thus when Kizy approaches him, she isn't much hopeful.

But opposite to her expectation, he agrees to help her out on one single condition i.e to marry him. And therefore Kizy is forced into this marriage.

But what will happen when these two people who can not tolerate each others's presence for even a moment are tied with the marital knot for the rest of there life?

Let's witness a crazy love saga unfold between Kizy and Markus filled with loads of action, drama, unseen twists and turns and off course a whole lot of romance.