Becoming an Immortal Starts from the Ground

New book is on the shelves, a thrilling adventure~ Alien species suddenly invaded the earth, and human civilization was forced to hide underground. But if alien species invaded even underground, would humans hide in the earth's core? This is a coming-of-age novel about the earth's secrets, bravery, and adventures. Let's see how the protagonist defeats alien species and grows into a heaven-defying existence!