Love History Caused By Willful Negligence - Chapter 9Vol. 1 :

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- Description from Novelupdates

In this world, people are granted a power said to come from the heavens, a mighty weapon tied to the soul of humans. Those who receive these magical weapons fight against monsters to survive, driving the economy of this world.Lian is just an ordinary boy until his world is turned upside down when another race takes away what matters most to him: his family. From that moment, follow Lian's journey as he seeks the strength to avenge those who killed his family and uncovers the truth behind his power.

Jaden lived an ordinary life. This was the life that he had lived for several years now. This kind of life was one that had existed ever since the death of his parents.His parents died in an accident, leaving him an orphan. The moment that his parents died, his uncles came over and took over everything that was supposed to be taken by him.He tried going to court, trying to see if he could get back the wealth that belonged to his family, but due to the connections that his uncles possessed, he did not succeed.Completely abandoned by his relatives and friends that existed before the death of his parents, Jaden was left to fend for himself.He managed to get a job as a bouncer in a club. But as a coincidence, he ended up irritating someone that he was not supposed to offend. And with that, he was beaten and left in an alley to die.But it was at that exact moment that out of nowhere, he was bitten by a dog. Jaden could not believe it. He had never expected that he was going to die just like this. And even before dying from the wounds that he had suffered from the beating, he was going to be infected by rabies?But the strange thing that happened was the fact that after the dog bit him, a holographic screen appeared in front of him.[Congratulations on being chosen by The Bodyguard System.]And with that, Jaden's life changed completely.

Kaidan (Kaidan refers to eerie tales of strange, mysterious, rare, or bewitching ghosts and monsters from Japanese folklore.) feed on cognition, wield information as weapons, and use information as currency, existing between the peculiarities of neither life nor death.They exist in human rumors and dwell in the shadows of the world.“Does this mean I will become a Kaidan?”In ancient times, they were worshipped as deities, empowered by faith.“Then I am a deity!”In more recent ancient times, they were regarded as demons and fed on fear.“I will become the master of Kaidan!”However, as the tides of time washed over, they gradually vanished, leaving behind only texts considered to be delusions.“To restore the glory of Kaidan is an undeniable duty of ours.”But you are not yet a Kaidan, hmm, nor a person.“Well, becoming a Kaidan counts as success.”