This wasn't something that was suddenly discovered, but more on a gradual basis. Gu Shinian would take special care of his young sister, and no matter what his sister wanted to do, he would agree.
It seemed that although Gu Shiyuan was very young, she was very smart and knew how to assess people's moods. When she saw that she was being doted on, she would keep asking for food to eat. She wouldn't do it outright, but she would just lie down on her stomach at the side and ask, Brother, does that taste good?
She didn't know many words, but she could remember words relating to food especially well.
If Gu Shinian didn't reply, she would keep asking, Bruddah, does that taste good?
Gu Shinian would be left with no choice but to share everything he had with her to eat.
Afterward, when she saw things that other people were eating, she would look at Gu Shinian pitifully and ask, "Bruddah, does that taste good?"