When The End Is Coming, I Sign In At The End

When the doomsday came, Qin Feng, who was trapped in a desperate situation, suddenly activated the doomsday sign-in system, and Qin Feng was invincible from then on!
Complete the Bronze-level sign-in task and reward Thunder Blade!
Complete the Silver-level sign-in task and reward the Iron Man armor design!
Complete the gold-level sign-in quest and reward the super warrior serum!
Complete the platinum-level sign-in task, reward…
While other survivors were still struggling in the last days, Qin Feng was already at the pinnacle of the world!