The right to file a reinstatement lawsuit is granted only to employees who fall within the scope of job security. Accordingly, pursuant to Article 18 of the Labor Law, in workplaces employing thirty or more employees, an employer who terminates an employee’s indefinite-term employment contract must have at least six months of seniority and must rely on a valid reason arising from the employee’s competence or conduct, or from the requirements of the enterprise, the workplace, or the job. For employees working in underground operations, the seniority requirement does not apply...