I Was a Loner, but My Class Got Summoned to Another World… - Chapter 210: Night in Megyeszorosz

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?

The first thing my childhood sweetheart's did after becoming a wealthy woman was to ask me to marry her, in my poor and destitute state, went to her family to become the son-in-law.“Marry me, and you can live in luxury cars and mansions as you please.No need for work or household choresPlenty of pocket money every day, amounting to a five-figure sumAnd if you want kids, I'll bear as many as you wish.”But when I became this toy boy, I gradually discovered the sickly yandere and perverted control side of my childhood sweetheart...An accident brought me back to the past, live my life again.This time, facing the temptation of childhood sweethearts, I decisively refused!In this new life, my slogan is, drum up the wallet, and stay away from the rich woman!Me: “Sorry, I am the man you can never get in this life no matter how much money you spend!”

The world had changed when the System arrived, alongside the Cataclysm that filled the world with monsters. The technology was gone, replaced by classes and skills that allowed the people to fight back. When Devon ended up as a Blacksmith, a class that didn’t grant Intelligence, he had to face the reality, that his old career that he loved - mathematical sociologist - was over. Instead, he had ended up as yet another discarded member of the production class, overshadowed by the existence of the System Shops to the point of total marginalization. But, what if all he needed was to reapply his scientific thinking to the System...

Who says that after rebirth, you have to slap faces, abuse scum, and revolve around enemies and men!Revenge is just incidental! Slapping faces and abusing scum are not the main battlefield of life!After being reborn, of course, you have to live out your own wonderful life, otherwise, it would be a waste of the chance of rebirth.