An event
In this small conversation, Bai Liyue understood a lot of things. She came to the conclusion that something big happened between both the sister, which made Chen Yuxi dislike her eldest sister. This tension or this incident created a big gap between both the sister and she wanted to fill this gap.
Today, when Mei Lin, her mother was showing her all the pictures and telling her all the childhood stories, she understood how dependent Chen Yuxi was on Chen Ziyue when they were little. Their relationship was quite deep and loving until, Chen Ziyue left home, and then their relationship suffered.
Chen Ziyue cut off all her contacts while Chen Yuxi turned cold. Since then, both sisters never spoke with each other. Bai Liyue could only sigh at the outcome. Chen Yuxi reminded her so much of her little sister, Bai Suyan. And, she didn't them to fall out like this.