Start by Killing Immortals with Mortals, and Live Forever by Enlightening Your Magical Powers.

Once Li Muchiu traveled through time, he thought he could become famous because of his status as a top scholar and a high-ranking official. But he never thought that the original owner was on the wrong team due to party disputes, so he was poisoned and had only a few days to live. When he wanted to end his life on his own, a dying immortal gave him hope. Then Li Muchiu killed the immortal and relied on a magical power to gain hope of survival. In his first life, he had to die all over again because of his sudden enlightenment of supernatural powers. In his second life, he was secretly killed because his changes were too great. In his third life, he was killed by an immortal because of a mistake in judgment. Then, unwilling to give up, he came back several times. Finally, Li Musiu finally saw through it and determined to prove immortality. "I don't want to be led by the nose anymore!" "I want to live forever, by any means necessary!"