Global Travel: I Was Left Behind

My name is Liu Ke. Everyone in the world has traveled through time, and I am the only one left. What should I do? "Didi, welcome to doomsday survival. Here you can't trust anyone. If you want tomorrow, you can only become stronger, and you will have everything to become the strongest and the glory of the world!" "System error, trigger location changed, conversion in progress, conversion successful." "Do you want to be strong, do you want to be rich, with this system, you will have everything!!!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.