I can return to the age of mysterious - Chapter 5 - 00 Basic Fighting Technique_1

A teenager who unexpectedly gets transported to the modern world from ‘the world of the immortals’ . He finds himself in the body of an ordinary guy. He wants to go back to his world and for that, he will have to practice to get stronger and investigate the reason why and how he crossed through to this world.

1. Download a suspicious game
2. Catch a few magical pets as partners
3. Go through interesting daily routines and lead the pet shop to a whole new level

- Description from Novelupdates

Cassian had lived his life in the most miserable way. He had scrubbed the floors and washed the clothes in the cold winter and done everything just to please his uncle’s family, but in return, they sold him to a merchant only for a pouch of coins.And the merchant decided to gift him to the king of Aetherlyn, a faraway kingdom from his small village to show his loyalty and curry favor from the king. And he was the lucky one from the group to be choosen by the king. Thus he got the position of palace servant.Cassian thought maybe his life in the palace would be different, but he was bound to be disappointed as the people in the palace were far more sinister and ruthless. Scheming ran in their blood.And can anyone tell him why his path always crossed with the notorious first prince of the kingdom? The seemingly cold prince had an unpredictable temper. And why was he always drawn to him like a moth to a light?Will Cassian be able to survive in the palace where the true faces are hidden behind masks, or will he become more entangled in their schemes and just become a mere pawn in their game?

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?