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Han Song, a young man who traveled to a strange world, found that his soul merged with the original owner's incomplete soul, giving birth to a new personality. When he finally got acquainted with life in this world, a man eighty percent similar to him appeared in front of him, and he knew his identity as a time traveler! Who is this man? There are as many adjacent worlds as there are stars in the sky. Why? Why did he travel to this world? What is calling him? All mysteries are waiting for him to find answers.