Return of the 8th class Magician

Read manhwa Return of the 8th class Magician / 8 클래스 마법사 의 회귀 / 8th Class Magician Returned,
It’s been many years since I’ve bloodied my hands for the United Empire and it’s emperor, Ragnar. I wanted to return to my home town and live a quiet life as if to repent for my sins.
However,
“You are a great 8th class magician who is able to overthrow me and the empire at any time”
“How could I let a monster like you stay alive?”
After being betrayed on the verge of death by Ragnar, who was my friend as well as my Emperor, He stabbed my heart with a dagger that had time magic applied to it.
“The redemption I want, is to put everything back to its place.”