City of Sin (Yanyu Jiangnan) - Vol 9 Chapter 127: A Woman Who Holds Grudges

Calling the old god’s mage, the knight who inherits the bloodline, looking forward to the glory of yesterday;

The noise of steam engines and the roar of cannons indicate the direction of the future;

An Sen, who was living in this world, embarked on a road that had never been imagined;

In the ashes of the old world…he shall be crowned king!

- Description from novelbuddy

Shi Yuhan is the most heartless and evil human Song Qinghuan has ever met. He's arrogant, sharp-tongued, ruthless, and heartless towards her. Yet, he asks (read threaten) her to marry him and she has no choice but to agree. She needs to get into the Era Group to investigate her elder brother's whereabouts.Will her sacrifice be worth it? Will she be able to find the truth of her elder brother's disappearance? Will Shi Yuhan continue tormenting her? What's his motive?

Satou Shiki a Japan present-day university student suddenly one day he got attacked by a slasher when he open his eyes he was already transferred to another world’s labyrinth city. In that another world he who was awakened to do a lot of “things”.