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

He is a clone. He is a clone that wants to kill. When he awoke, the only words he remembers are, “If you meet the Buddha, kill the Buddha, If you meet the God, kill the God.“ His “older body“ was killed mysteriously. Rumor says that his “older self“ was tortured and killed by a group called “Alethia“. Now, Alethia are hunting him. And he must stop them, stop this terrorist organization before they destroy the whole world.