The North Korean military in man power is a well bloated figure. The army alone is numbered at 1,000,000 men vs the South Korean 522,000 active army personnel.
The US military keep around 28,500 military personnel in Seoul to support South Korean troops in the eventuality of war.
The North Korean military also outnumber the South on tanks, artillery and submarines. However the South Korean navy is far greater in number and have more aircraft than the North.