Infinite System Inheritor Return From The Abyss Novel

Han Seojun, a frail young man raised in poverty by his hardworking mother, inherits the Ancient Infinite System at eighteen—a divine power passed down from Goddess Zyraena, the former Echidna. Over five months, the system strengthens his body and improves his family's circumstances. But just as Seojun prepares for his veterinary exam, he is suddenly transported to the Abyss Realm, a brutal world once ruled by Goddess Zyraena but now dominated by the Fallen God Grimzark. Armed with his Infinite System and alongside his Guardians Cerberus and Hydra, Seojun spends five hundred years battling to reclaim the realm, eventually reaching maximum level and obtaining the SSS-Rank Abyssal Tamer class. Upon returning to Earth, he discovers five years have passed and the world has fundamentally changed—dungeons and monsters now exist, and a Global System has granted abilities called skills and classes to people known as Awakeners. However, Seojun's Infinite System protects him from the Global System, making him classified as a glitch and Non-Awakened, though his level has reset to one.