Lawyers apply for criminal filing on their behalf.

You can't. The defendant was not allowed to contact a lawyer before he entered the investigation scope of the public security organ and did not file a case. The concept of filing a case refers to the litigation activities in which the public security organs and people's procuratorates discover criminal facts or suspects, or the public security organs, people's procuratorates and people's courts review the materials of reporting, accusation, surrender and prosecution of private prosecutors, and decide to investigate or try criminal cases according to their respective jurisdictions.