Lin Ziyin is a scar that will never be erased from Shu Nancheng's heart. His indifference to her and his sarcasm towards her were all caused by that scar.
In the past, Lin Ziyin would make a big fuss about even the smallest things, for fear that he would not know. But now she has learned to be strong.
If time could go back, Lin Ziyin would rather not fall in love with Shu Nancheng. Since she fell in love, she had to fulfill her promise, guard a city alone, and spend her whole life.
Intention: self-reliance, self-improvement