Mr. Fang's Feisty Mistress - Chapter 358 His Ex And His Current

Yuki, a high school junior, dies heroically saving a stranger and is reincarnated in a fantasy world, where he discovers an extraordinary and unrivaled power.

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

Liu Sanniang was reborn. When she remembered her lonely end, she decided to get married in this life no matter what.She only wanted to marry an average scholar, but who knew that the tall and striking future general, Chu Yan, took an interest in her.The first time they met, she was too shy to look up at him.The second time they met, he sandwiched her against the wall and said, “Are you afraid of me?”The third time they met, he squatted down and said, “Come on, I’ll carry you.”***After meeting a few more times, he came to ask for her hand.However, he was at least two meters tall and muscular. She feared that he might squash her to death!Once they got married, Chu Yan strode over to her and ‘forcefully’ grabbed her hand, ready to pass his life savings to her. Yet, his delicate and beautiful bride fainted out of shock…Liu Sanniang then realized that being with her ‘scary’ husband meant living peaceful and leisurely days, so her eyes narrowed as she grinned.

The formless ancient world was infested with despicable demons. They hunted and feasted on mankind, keeping the human civilization constantly in a weak and suppressed state.