Because they both had their own reasons for hiding these things from Li Weixiao. Gu Hong hid these things from Li Weixiao because he wanted to make her forget about Liu Xiu and Ling Xue had no idea about who Liu Xiu is.
This new piece of information that has now been revealed in front of Li Weixiao has made her more angry on both Gu Hong and Ling Xue.
Because with this new revelation Li Weixiao came to know that this woman Liu Xiu who is standing in front of her is one of the most important part of her past and life.
So after knowing all this information about her past Li Weixiao looked at Gu Hong and Ling Xue alternatively and in that look anger is clearly visible to both of them.
Ling Xue who has seen this look on the face and in the eyes of Li Weixiao became very terrified because this is her first time seeing Li Weixiao with that angry look.
