When Time Doesn't Exist

There are two boys, living in an advanced world, experimenting and practicing time traveling and traveling through space to visit their old world. One of them is responsible for controlling the time and the other one is responsible for teleportation. As they visited their old world where they were supposed to be living, they found a friend that was living by herself. They shared memories and experimented time traveling together until they accidentally saw the future. Would they leave it as it or would they change the timeline with a lot of consequences to face?

Language: English