Really Invincible? or Fake Invincibility?

(No heroine + crazy protagonist who does whatever he wants + time travel + slightly funny + decisive killing) A young man with mild paranoia and the desire to be a savior accidentally fell into a magical world. The real golden finger has arrived, practicing like cheating, as long as you understand the principle, you can achieve a breakthrough in an instant. The golden elixir stage is when the golden elixir is condensed in the body? The golden elixir is formed in the next second, and the Nascent Soul stage is about condensing a small person in the body? The Nascent Soul is completed. What secrets are hidden under the thunder tribulation, and what is the real history... Each mystery on the road of cultivation is just a matter of one punch in the end. Remember in the world of cultivation, killing requires cutting grass, and breaking bones requires raising ashes.