One of the eligibility conditions for the WSP is that employer must retain the employees for 6 months. If there is an employee who resign voluntarily and the employer is receiving the Wage Subsidy, does the employer need to apply again to reflect the changes?

No. If the employee is resigned voluntarily within the first 3 months of the subsidy period, the employer will only need to update the employee information in the system. If employer failure to do so, it will subject to legal action