Am I an Octopus?

Ten years ago, in a bizarre accident, Li Chen traveled to this world and passed by the Li Chen of this world. When Li Chen woke up again, he had returned to his appearance when he was 7 years old, just like Li Chen in this world. In this bizarre accident, Li Chen's family in this world was razed to the ground. His parents and toddler sister were also missing in the accident. In fact, it also includes Li Chen himself, because the Li Chen now is no longer the Li Chen of this world. The only 'survivor' is seven-year-old Li Chen. Ten years ago, strange 'black holes' began to appear in uninhabited areas around the world. Later, these 'black holes' were named 'secret realms'.