The Unfavored Prince is a Genius Alchemist: I'm Not Cut Out to Be Emperor, So I Want to Dote on My Younger Siblings

A man reborn into a magic-filled empire where he becomes Arsha, the emperor's eldest son—but not the legitimate heir. Content to leave the throne to his younger brother, Arsha retreats to the edges of the palace to pursue alchemy, a forgotten art no one bothers him about. He creates Sephira, an intelligent being born of magic rather than science, and while raising her, he hopes to finally experience the loving family bonds he never had in his previous life. However, the nobles remain suspicious of the first prince's activities, forcing Arsha to dodge their schemes while pretending to be a harmless child—and occasionally striking back when pushed too far.