MTL - Card - Chapter 74 in a hurry

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

Cho Kang-hyuk, the owner of a large fitness center, woke up to find himself a young disciple at Shaolin Temple.

Kurogami Ichiro was desperate because he couldn’t achieve what he wanted when he once started his martial arts path at age of 8!

“It was a book.It was a scripture.”Its cover was made of the skin of those who hold a grudge against humans.Its words were written with the blood of those who hold a grudge against heaven.Its weave was created from the sinews of those who hold a grudge against earth.The ancient demonic object, restraining darkness shaking heaven scripture (制暗震天經).Yeon Sang-hyeon, who signed a contract with the restraining darkness shaking heaven scripture at the last moment of his days, is now rewriting his own destiny.The peerless genius met the ancient demonic object!