I, Five Years Old, Have Returned from the Secret Realm.

When he was five years old, Lin Chen was abandoned by his parents in the beast tide of the Falling Star Abyss. In order to save their twin brother who was born weak, the parents of Gangqi Realm made a cruel choice - leaving him alone in the ancient forbidden area, promising to come back soon. But the space barrier suddenly closed, trapping the five-year-old him in this secret realm of death forever. Lin Chen, who unexpectedly received ancient inheritance, practiced alone for fifteen years in a secret realm where strange beasts were rampant, with a fixed five-year-old appearance. When he finally waited for the new passage to open with his peak strength in the God Transformation Realm, looking at the group of outside explorers who couldn't even recognize the basic dangers, this "child" who would never grow up finally saw the way home. It's just that he doesn't know if there is anyone in the outside world waiting for him fifteen years later.