If Gu Sheng knew that his parents had given him away, even if Mr. and Mrs. Gu hadn't taken any money for it, it still wasn't the right thing to do to send their child away. Couldn't they have begged someone else? Moreover, they had never sought Gu Sheng's opinion. At that time, Gu Sheng was old enough to understand the situation. It would have been logical for Gu Sheng to have even a seed of displeasure in his heart because of his parents' unilateral decision making without informing him.
Over the years, if Gu Sheng really were alive, could Gu Sheng say that those people hadn't truly saved his life? He couldn't.
Gu Nuan knew her brother well; he was a child who inherited their father's nature and was very sincere in character. His judgments would never be made purely based on emotion, but rather on the facts at hand, assessing right and wrong according to reason.