No Time

No Time summary:

Even before the apocalypse, Shui Yu 's family and life were falling apart. So when he went back to the time when he was born, he tried hard to prepare and teach his siblings so that they would not be separated in this lifetime. But even though he was very OP(too OP in fact), troubles came his way. He just wanted to get rid of boredom and travel the world... but who 's that mad scientist chasing him?...