After Meng Xueqing died, she discovered that her sister was just a cannon fodder in a book. Not even just this book, the cannon fodder in many books was her sister. She was unwilling to turn into a ghost. She was picked up by the system before she lost control and embarked on the road to change her sister's destiny.
1. Sisters are the same person, and sisters will never turn against each other.
2. Whether the sisters have CP depends on the individual world.
Idea: The protagonist in some stories should learn to walk on his own