Do you know the grandmother paradox?
If you go back in time and kill your grandmother before your mother is born, this action will create a contradictory situation: you go back in time and kill your young grandmother. If your grandmother dies, there will be no mother, and if there is no mother, there will be no you. So who killed the grandmother?
Your existence means that your grandmother did not die because of you, so why did you kill your grandmother?
"Can you believe it? I went back to the past and was killed by my past self. This is ridiculous, isn't it?" "Then who am I?" "Aren't you Gu Fangshuo?"
"Maybe this is a dream you had. When you wake up from the dream, it will be fine."
"Are you admitting it? You are not the person I know. I should call you -" "Gu Ba?"
Intention: Time grows old and passes quickly. If you don't cherish time, time will abandon you.