MTL - Garbage Skills Become the Strongest In the Ninja World - Chapter 10 Dance Flow·Ancient Martial Arts

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

A striking man of mysterious origin and peerless talent, he looks back at the world, in all its entirety, with utter disdain. And yet, in the treacherous and unpredictable ultimate formation of the Boundless Secular World, he guards a breathtaking ancient qin with broken strings, waiting silently for the destined one to arrive!

In a world fraught with innumerable dangers where living day by day is a struggle, a young man from the modern age transmigrated into such a world, accompanied by a peculiar system made for assassination.

Lin Xinyan was set up a one-night stand trade with a stranger man to get the medical treatment fee to save her mother. That night took her virginity and got her pregnant. Lin Xinyan never touched her husband-Zong Jinhao, until one day she found out her crippled husband was involved with another woman. The woman met her and recognized that Lin Xinyan was the one that she set up for that one-night stand. When she knew Lin Xinyan was pregnant with Zong Jinhao's child, she tried to kill her and her baby with every means she could. But Lin Xinyan didn't know that the man who slept with her that night was her husband, nor did Zong Jinhao know the baby was his, until one day...