I am a property security guard. I didn't buy insurance for treatment in Tianjin.

According to the law, employers should provide social insurance for workers. If the failure to provide social insurance causes losses to workers, the employer shall be liable for compensation. You are a property security guard, that is, an employee of a property management company. As your employer, the property management company did not apply for social insurance for you. The medical expenses of your illness should be reimbursed by the property management company, and you should be given sick leave pay during the treatment period.