With the sudden appearance of dungeons came a horde of monsters that devastated humanity, overpowering even the gifted Awakened individuals meant to combat them. Amidst the chaos, Seong-In Kim, the strongest of the Awakened, remained as the last hope. Upon his demise, Seong-In finds himself transported twenty years into the past, inhabiting the body of a regular high school student named Su-Hyeon Kim. Unsure of the reason behind his resurrection, he recognizes this as an opportunity to rewrite history, to prevent the world's downfall, and to carve a new destiny as a savior.