In the future, everyone will have a rocket, and most of the interstellar planets will be occupied. Only black holes are taboo.
When Gu Xingran came of age, he received a rocket as a gift from his father and was sent to find a new base alone. He lost control and rushed towards a black hole during the voyage.
Unanswered and helpless, he fell into a black hole and bumped into someone who looked exactly like himself.
The other party is him from 120,000 years ago, telling him that the planet outside the black hole is recurring in a cycle of 120,000 years.
Intention: I saw a sentence: Everything will happen again in 129,600 years