Not illegal. Teacher Mu is a doctor of criminal procedure law. She is an on-the-job criminal procedure officer of the Intermediate People's Court of Liaoning Province. She has been engaged in civil servant training for eight years. She teaches Gong Ji general knowledge, public security professional knowledge, and conducts examinations and interviews. The lecture is humorous and beautiful, and the knowledge points are very detailed. Because the lectures are all legal knowledge, it is not illegal to give lectures.