Krizantem

Martin became an orphan when he lost his family in a mysterious accident at a young age. Although he was orphaned, it did not affect him because of the mental problems he had. When he grows up to a certain age, he joined the world of crime and began to improve himself.within 10 years he became one of the most dangerous serial-killers known in the dark world. He also started killing people for money.

But he died of an explosion on his last mission. He also had a system to help him in this new world.

A soulless and emotionless serial killer from the old world had to give life in a fantastic world. But what he didn't know is that the powers that were possessed in this world would change itself.
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The Inheritance Mission - Chapter 336