MTL - Live Surgical Broadcast - Chapter 17 With a girl

When the Earl’s daughter, Serafiona, met the Holy Beast, she realized that she had reincarnated as the villainess of a fantasy novel that she had read in her previous life. This is the story of Serafiona avoiding her worst fate and her dream to become an adventurer with the Holy Beast, Lu.

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

Lin Xiao was an orphan who strived to get stronger while living with his sickly younger brother in an unnamed small village.