Mushoku Tensei: Reincarnated as a Beast Race - Chapter 221 - A New Kingdom, Much to be Done

In the rebirth, in order to prevent the tragedy of the previous life from happening, Bai Yu decided to rush to the [Tower of God] at any cost, and face everything together with his sister!

However, Bai Yu, who was bound by the system, mutated his bloodline, and transformed into a black-scaled python seems to be developing on a completely different path from his previous life…

- 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?

A striking man of mysterious origin and peerless talent, he looks back at the world, in all its entirety, with utter disdain. And yet, in the treacherous and unpredictable ultimate formation of the Boundless Secular World, he guards a breathtaking ancient qin with broken strings, waiting silently for the destined one to arrive!

[Female Protagonist Synopsis]:Mia Ginger experienced a trial marriage.Before the trial marriage--Dad said: “Koa Jackson is a postdoctoral fellow, watch your words and deeds.”Mom said: “Since you don't like him anyway, why not let your sister have him.”Brother said: “Shameless, stealing big sister's beloved.”Sister said: “Why didn't you come back a month later!”Mia Ginger didn't understand, she was already seventeen years late, late enough that the whole Ginger Family completely forgot her existence, late enough that the adopted sister occupied seventeen years of affection, late enough that the man she was betrothed to almost became someone else's groom, how much later should she be?Mia Ginger curved her lips: “Grandpa Jackson, I will strive to be worthy of Brother Jackson.”She thought it was out of spite, unaware that upon meeting him again, she discovered he was the big brother lingering in her heart for nearly ten years.At two years old, she got lost, falling from a Rich Family's Daughter to a street beggar, picked up and raised by a masseuse for seventeen years, and upon returning home, she was determined to become the first socialite in upper-class society.[Male Protagonist Synopsis]He is Koa Jackson, the third son of the Jackson Family, elegant and upright, with outstanding looks, the youngest neurosurgery professor in the domestic medical field, known by all.Simply because, at twenty-seven, he remains single.All young ladies want to marry into the Jackson Family, unaware the nobleman was betrothed since birth.In his entire life, he need only remain pure, waiting for one girl to grow up.Before the trial marriage, Koa Jackson had seen his future bride twice.The first time, he was eight, she was eight months. He stood by the bed watching her crawl with her little bottom, finding it amusing, he wrote his name on her sole and said with a smile: “Brother will stamp you.”The second time, he was eighteen, she was ten. He stood by the road watching her sneakily stealing, feeling pity, he took her hand and gave her a hundred yuan, helplessly saying: “Not stealing is a good child.”He's always remembered the first time, long forgotten the second.Unexpectedly, the little girl whose foot he tickled at home always regarded the second time as her life's salvation.[He couldn't partake in her turbulent past, but wholeheartedly takes on her prosperous future; companionship is the most touching confession.]