21:00
In the secret underground tracks of Yijin City, the Joint Train, stretching over 15 kilometers and consisting of more than 500 carriages, silently rests in the darkness, with all lights extinguished.
Over 4,000 survivors are huddled in the doomsday carriages, tensely waiting for the changes outside.
The entire underground tunnel is filled with a damp and suffocating atmosphere, with occasional dripping sounds of underground seepage echoing from the depths of the darkness.
The survivors in each carriage hide in the shadows, mothers covering their children's mouths, men gripping their weapons in readiness, and all communication is carried out through comms devices—everyone feels as if their heart is in their throat at this moment.
