A man who had lost everything. An almighty power, the [Zero Code] held within his hand. “Player Kim Su Hyun, do you truly wish to revert the time of Hall Plain?” “I want to go back 10 years. To that...

Metalia, a world where mechanical creatures called the gears stroll. It was the so-called "machine hunters (collectors)" who hunted those who ruled the earth with mighty power. A boy now descends in Melzam, ...