Xiaojiu has known since she was born that she is definitely a Mary Sue
——Because she dreams about another version of herself every day, for a lifetime.
It wasn't until the day she turned 20 that everything changed. She went from dreaming to time travel, and because her body was gone, she could only possess her.
So today is also the day when Xiaojiu becomes "her" sister
Just ignore the grandmother paradox (ノ=Д=)ノ┻━┻
Grandma Paradox: No matter! Reject! Turn down!
Xiaojiu:...(Tears)
ps: To practice writing, you welcome greetings (just simple greetings) and advice in the comment area, but I hope you can clarify where there are problems, such as inappropriate wording, logical contradictions, etc. I refuse to discuss the general direction (plot outline). This article will be changed from time to time according to the author's mood, but the main line remains unchanged.
Intention: to be added