How did Anna know?

Xuan Zi Yi's character Mao Fei Fei was made angry by Xue Ning's casual remarks. Her anger could not be explained and because in real life Xuan Zi Yi hated Anna, her reaction was perfectly in line with what was written in the script.

She regarded Xue Ning coldly, "Do you even know who that man standing behind you is or are you pretending not to know?"

Xue Ning clicked her tongue in annoyance, "What is your problem whether I know him or not?"

She had been interrupted by some unknown woman when she was speaking to the King of demons so it was easy to see that she was angered.

Her response triggered something inside of Mao Fei Fei and she nodded as if she understood something, "So you are working as one, is that it? Then we're you also involved in taking my lover away?"

Xue Ning's eyes changed, "Little girl, you talk way too much! Like I said, Mommy and Daddy were busy and you are interrupting us!"