[Two male protagonists + two strong characters]
"If the abyss is destined to swallow us up, at least let me hold your hand and fall together into this eternal eternity."
When they first met, they were temporary partners full of suspicion and temptation. Under the strange rules of the abandoned hospital, amidst the ancient curse of the foggy ancient town, and among the crazy creations in the withered laboratory, they fought side by side to save each other. Trust is built on the edge of life and death, and emotions grow in silence. From using each other to relying on each other in life and death, two lonely souls have become each other's only light in the endless abyss.
However, crises ensued. The strange dungeon changes, the covetous guild forces, the hostility of the powerful people on the Babel Tower list, and the shocking secrets about the origin and end hidden in the "Abyss Corridor" themselves... All force them to continue to become stronger.