The Book of Abbadon - Chapter 10: Sovarohm

A legendary powerhouse of his generation, tired of the bustle of the peak, returned to the ordinary city and started a new life as an ordinary teacher. He wrote the legend in the city.

Magnificent mountains and rivers, the rising powerful ones. Some ancient martial art masters stood at the peak, becoming legendary. Some financial crocodiles rose up in the minuscule places, laughing arrogantly.

However, watching the school beauties was better than fighting and killing; educating was better than fighting for fame.

- Description from Novelupdates

mc gets transmigrated to Fallout New Vegas with the merchant system. let the questionable adventure begin.

[Ding!][Your pickpocketing skill increased by 5. Reward: your PP increased by 50.]“System, use my Pop-star Points to increase my singing skill!”…[Ding!][You had won 1st place in the Californian Young Star contest. Reward: your CP increased by 400!]“System, put all these Criminal Points into my martial arts skill. Now I will crush anyone who stands in my way!” Tristan was born with everything he needed to become a star: rich parents and musical talent. However, after a car crash destroyed his handsome face and voice, everybody turned away from him.With his dreams burned, Tristan ran from home and became a small-time criminal to survive. Then, his own gang mates betrayed him, throwing him to the cops.But Tristan is saved by a sudden stroke of luck.[Congratulations, Tristan Hayes! You won the Heavenly Lottery. Your prise is ‘Second Identity System’.][Increase skills and status of one identity to obtain 10x rewards for the other one.]Mafia and showbiz may appear far removed from each other, but both are united by money and ruthlessness within.Now it’s Tristan’s time to navigate both realms to become the world’s first mafia superstar!

"When will people understand.... I'm only half insane?"