Nora became upset and ignored Justin's messages the whole night the other time because Ruth had said that she knew Y.
However, it wasn't really because she was angry. Rather, she had been just been puzzled by the discomfort she had felt when she heard what Ruth said. That was why she hadn't replied to his messages.
Later, when Justin hacked into the special department and personally explained the incident, she had returned to her usual self.
Even though Ruth was deliberately speaking with Justin in front of her at the moment, Nora did not become suspicious of Justin right away.
She felt that since the two of them liked each other, they should trust each other.
Besides, Ruth had always been fond of cheap tricks.
Therefore, Nora merely raised her eyebrows and looked behind her at Justin.
