Black Corporation: Joseon - Chapter 106

Summoned after an unfortunate accident in hopes they could protect the world from a coming threat, Ben and his classmates are gifted another chance at life. With fame and fortune promised to whoever is willing to fight for the sake of the world it doesn't seem like a bad deal, there's just one small problem. Ben wasn't blessed with any magic or combat skills, just crafting and enchanting. While the skills themselves aren't useless they also aren't seen as being necessary to the coming war. Now not needed and alone Ben tries to find a place in the world while meeting some of its colourful characters along the way.

“You’re the moonlight that lights up the night’s darkness~

Travel through the Naruto world and be reborn as a dried persimmon ghost shark.

“As a dam maintainer, I carry two hundred catties of lime with me, which is very reasonable and reasonable, right?”

“The so-called unlimited physique means that you are in charge of physique, and I am in charge of unlimited.”

I kidnapped and robbed, didn’t pay my debts, beat up the elderly, bullied children, attacked others without telling the truth, and often killed my superiors and employers…

But I know that I am a good ninja.

I have the heart of a bodhisattva, the face of a vajra, and the means of demons. I walk in the darkness of the ninja world, but I pursue a bright future where everyone is like a dragon.

I, the dried persimmon shark, was born a miscellaneous fish, and swore that one day, I would smash this boring world dominated by blood theory.

- Description from novelbuddy

In a future timeline, the earth was visited by a species known as the Slarkovs.
Having lost their home planet and in search of a new one, earth was the next habitable planet for them.

Humans and Slarkovs made a deal with each other in return for the Slarkovs living on earth.
The Slarkovs traded their technology and knowledge for a new home.
They were similar to humans except for some of them who had slight differences so fitting into the society wasn't a problem.
Over the years Slarkovs and humans began to mate with one another and reproduce offsprings.
This in turn created a new species known as the mixed-blood.
Centuries later mixedbloods could tap into their bloodline and perform unimaginable feats.

Gustav born into an age where bloodline determines everything, struggles to fit with a useless bloodline.
His bloodline only grants him the ability to change his hair color, destroying his hopes and dreams for a great future.
His fate is turned around when an unexpected situation leads to him finding a system that grants him the power to unlock and upgrade bloodlines by completing quests but he's baffled by two quests with a five-year deadline. Success will grant him unimaginable rewards...
But only one thing awaits him if he fails... Death!

Follow Gustav on his interesting journey filled with unprecedented adventures, danger and death, maybe?