I Raised the Priest Male Lead into a Tyrant

“Weren’t you supposed to become a healer?” “I did become something similar.” “Something similar? A High Priest?” “An Emperor.”
How on earth is an emperor anything like a high priest?I possessed the body of Selena, a supporting character whose name doesn’t even appear in the original story.Honestly, even better.Rather than reincarnating as a villainess and struggling through endless hardships just to change the ending, being a minor side character sounded much easier.…Or so I thought.“Selena-noona.”How could I possibly ignore the male lead, who followed me around like a baby duck imprinting on its first human?Selena became the male lead Riotis’s close friend and guardian, determined to give him at least a few good memories in his harsh life.But one day, she is adopted by foster parents and forced to part ways with him.It’s fine. Riotis will awaken, become a high priest, meet the female lead, and live happily ever after.At least, that’s how it was supposed to go.But then—“I’ll never let you go again, Selena.”The male lead, who should have become a high priest, returned instead as an emperor.And not just any emperor—a tyrant who treats beheading people like child’s play. What on earth happened to our angelic Riotis?
How did I end up raising him into a tyrant?!