The Disfavored Prince is a Genius Alchemist (Light Novel) - Vol. 1

One day, a man who dreams of having a loving family is reincarnated into the magically advanced Iscarion Empire.
His new name is Arsha.
Born as the empire's unlucky first prince, Arsha is denied the right to succeed the throne because of his bloodline-and even his beloved younger brothers are destined to keep their distance from him. So instead of clinging to power, Arsha willingly hands the throne to his younger brother and chooses a life of freedom, devoting himself to his true passion: alchemy.
His overflowing talent quickly leads to an incredible breakthrough, the creation of Sephira, a brand-new intelligent life-form. By fusing magic and science, Arsha even turns himself invisible, granting him access to every secret within the imperial court.
Without meaning to, he outsmarts powerful nobles and begins quietly influencing the empire's bitter succession struggle from the shadows.
"I wish they'd call me 'big brother' someday¿"
Unaware of his own impact, a laid-back genius slowly takes control of the empire for the sake of his little brothers in this heartwarming fantasy about family, invention, and accidental domination.