Sugar was what Lin Yaozu saw unintentionally while he was at the station.
He suddenly remembered that as a child, Lin Yurong had often been beaten for this sugar.
Lin Yurong and Lin Yaozu were close in age and both loved sweets and what were called junk foods as children.
However, their parents gave all the treats to Lin Yaozu, forbidding Lin Yurong from taking any.
Lin Yurong was young back then and had tried to resist, but each attempt ended with a brutal beating and the so-called "you're the older sister, you should let your brother have it..."
After a few such ordeals, Lin Yurong stopped saying that she liked sugar.
By the time Lin Yaozu reacted, he had already bought a bag of candy.
He didn't know why he had bought it.
What was the point of buying it now?
But he bought it anyway.
Lin Yurong cried for a long time because of a bag of sugar.