Kill The Emperor is a Manga/Manhwa/Manhua in english language, manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

“There should only be one sun.” “Two suns will only burn and kill the empire’s people.” Alexar, the great wizard who ruled the empire, was betrayed by her close friend Gillian Terzios, whom she followed and trusted, she was reborn again as a master swordsman on the outskirts of a small country. Alexar, the great wizard, moves to seek revenge on Gillian, her close friend and the only nine-star prosecutor of the continent.