Infinite System Inheritor Return From The Abyss

Han Seojun, a frail young man from a life of poverty, inherits the Ancient Infinite System from Goddess Zyraena, also known as Echidna, the Goddess of Monsters. Over five months, the system strengthens him and improves his life with his hardworking mother. Just as he prepares for his veterinary exam, Seojun is abruptly summoned to the Abyss Realm. There, a quest awaits: defeat Grimzark, The Dread of Tyrant, and reclaim Goddess Zyraena's realm, which Grimzark took over after defeating its guardian. After 500 years of continuous battles with his guardians, Cerberus Huno and Hydra Silla, Seojun succeeds, maxing his level, obtaining the SSS-Rank Abyssal Tamer hidden class, and the title Lord of the Abyss. Upon his return to Earth, five years have passed. The world has changed dramatically, with dungeons and monsters appearing everywhere. People now have skills and classes from a new "global system," turning Earth into a reality game where they are known as Awakeners. Seojun, however, rejects this global system, protected by his own Infinite System. Classified as a glitch and a "Non-Awakened" by the global system, his level resets to one.