Logging Out Is Too Hard

A brief description of the manhwa Logging Out Is Too Hard:

Woojin Kim is trapped inside the virtual reality game Evil Tale, and his very existence in the real world has been completely erased. After enduring endless despair, a “Logout” window finally appears! But pressing it does not send him home—it thrusts him 50 years into the future, landing him in a ruined, apocalyptic version of the game world!

During a deadly monster raid, the heroic swordsman Raul sacrifices himself, allowing Woojin to absorb the soul of the ancient divine beast Sarvandin. Instantly, Woojin is forcibly logged back into the past game world with a new, absolute quest: “If you want a true logout, prevent the destruction of this world!”

Armed with knowledge of the ruined future, the ancient secret technique Yongcheon, and the broken authority Mark of Hunger, Woojin becomes an unstoppable force. Shattering the immortal records of the 1st-ranked player Kerga, he draws the attention of the entire server as he charges relentlessly toward the 100th floor of the Labyrinth Tower—a place said to grant any wish. The perfect walkthrough by the only player who has experienced the apocalypse begins now!