MTL - My Items Have an Upgrade Panel - Chapter 308 naturalization of scientists

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

After the Fall of Guardian God. His legacy was passed on to Zack. Zack, Who was quite ambitious and Powerful. Can He follow the footprints left behind by the Guardian God or Forge own damn legacy till the end?

He is Smart, Calm, and Collected. Decisive during decision-making. He learns and grows. In the world of Humans, Monsters, and other unknown species. How is he going to overcome the challenges? and began his journey towards the Unknown.

Tong, a sinner who was suffering endless torment in hell because of his mistake he had done in his previous life, was giving other chance to redeem himself by the devil.

Cheng Xi, a guileless psychiatrist with a heart of gold, who would do anything for her patients. Lu Chenzhou, a frigid businessman who refuses treatment for his emotional detachment.