1. The virus was not eliminated: At the end of the game, although the player successfully defeated the virus, a new infected person appeared in the last scene, suggesting that the virus was not completely eliminated. This means that the virus still exists and will break out again.

2. The future of mankind is uncertain: at the end of the game, players and other survivors look for hope of survival in the ruins after the virus broke out. This implies that the future of mankind is uncertain, and players and other survivors need to continue to work hard to survive.