The one who understood Xue Lin the most was Mu Lan. So she had a good idea, how far Xue Lin could go when she would be angry.
Mu Lan recalled, last time when someone tried to insult Xue Lin in the cafeteria, she gave a befitting reply. Xue Lin just opened her mouth and told that girl her innermost feelings as well as her desires. She also told, how many men the girl has played with.
Mu Lan was so shocked that she couldn't even talk. Later, she found out the truth.
That girl was disturbing Xue Lin ever since the very beginning. So Xue Lin always followed her and gathered all sorts of information she could get. She just waited for a good time to let that girl taste her own medicine.
And in the cafeteria, Xue Lin got a great opportunity. So, she didn't slip it away. After the incident the girl was transferred to another school.
Mu Lan found out how scary Xue Lin was and she tried her best not to offend her.