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An ordinary boy accidentally traveled through time and started his second life. Later, he gradually discovered the specialness of his body, his natural strength and strong bones. For the first time, he had the idea of ​​​​going out to explore and see the world. On the journey forward, he regained his youthful fantasy and became a hero. In an accident, he opened the secret of his body, entered the extraordinary realm, and got a glimpse of the wonderful world for the first time!