Who Took Away His Cause and Effect?

Lin Yang traveled through time, but he didn't know that he had been deprived of his cause and effect by using the ancient forbidden technique "Cause-Eating Fruit-Deceiving Formation". Someone is wearing his appearance and living for him. He became the only person in the world who did not exist. No one knows him, no one cares about him, not even Heaven can count him. While he was struggling for life and death in the secret realm, the impostor was hiding his identity and was thriving in the secret realm, surrounded by countless people. Until one day, the impostor sent someone to kill him. He looked at the face that looked exactly like his own and smiled. He began to use this identical face to wander between the real and false identities, stirring up trouble. When he regained his identity, he touched the ultimate secret of becoming an immortal in this world. Only then did he realize that he was the biggest cause and effect in the world.