A child who was easily fooled was probably a kind child. In Xixi's case, she had no choice since she had two cunning boys around her.
Ye Xicheng used to think that he must be the most loving brother in the whole world before he knew Yuan Mo. Once he got to know Yuan Mo, he believed that Yuan Mo had always been wanting a sister but his parents weren't planning for more kids.
Yuan Mo always caved in when it came to something that Xixi liked.
Yuan Mo's exact words when explaining himself were: could you bear seeing her disappointed face?
Ye Xicheng actually wanted to say that he very much could.
But Yuan Mo couldn't, and Xixi knew it very well. So knowing that Yuan Mo would say yes to every request of hers, Xixi stopped bothering her brother and went straight to Yuan Mo whenever she wanted to ask for something.