Creepy Pharmacist: All My Patients are Horrific - Chapter 1 – I, in the Otherworld, have activated hacks

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

- Description from Novelupdates

Everything was wrong in Dante's life, so in one last breath, he faded away, thinking he could finally rest in peace. However, fate played him another hand, changing his course and reincarnating him into a completely new world, born again as an orphan. He was soon adopted by the Strongest Vampire in the World, Valentina Scarlet.Amidst the dawn of the New Era, prophesied as “Age of the Stars,” where incredible beings with power will dominate everything within their reach, Dante finds himself immersed in an era akin to a frenetic flame of madness that will ignite the hearts of youth to the far reaches of the stars. Now, Dante only wants to become the strongest of them all to protect his beloved wives whom he will encounter along his bloody path.The Demon King of Devastation will shake the world completely, and the world will tremble. Lastly, if you truly enjoy the story, I invite you to leave your comments, criticisms, and stones of power! I need your support to rise higher every day!

Mason was a mercenary, until the day he died on a mission after being betrayed by his unit.

‘Less than a month old… I became the the great empire’s treasured princess…!’