Kill the Emperor

“There must be only one sun.” “Two suns would only burn the empire's people to death.” Alexar, the Archmage who once commanded the empire. After being betrayed by his trusted and loyal friend, Gillian Tercios, he is reborn as a reckless swordsman in a small, remote fiefdom. To exact bloody vengeance upon Gillian, his once-beloved friend and the continent's sole 9-star swordsman, Archmage Alexar begins his move. (Source: Naver, translated) Note: Includes one extra chapter.