Global players are trapped in the cross-era MMORPG "Nightmare," unable to log out. Furthermore, if your game character dies, you die in reality! The only way to escape the game is to complete the storyline and defeat the final boss. Former professional player Abyss, trapped within, was about to face the final boss after countless hardships, only to be betrayed by his best friend. Filled with hatred, Abyss is reborn with a god-level secondary profession. This time, he vows revenge! But as the game progresses, the truth slowly emerges. Things... seem far more complicated than he imagined...