The Time Key: Swap Lives, Save the Future!

What if your future self came back to warn you—and swap places? In a world 150 years ahead, ravaged by a deadly virus and war, a man discovers the only way to save humanity is to trade lives with his present-day counterpart: an ordinary guy crushed by everyday struggles. One journeys to the apocalyptic future to destroy the virus his own bloodline created. The other returns to face a brutal present with newfound knowledge. No magic. No game systems. Just raw sci-fi, time paradoxes, and impossible choices where love, betrayal, and survival collide.