Heaven's Soldiers

When North and South Korea plan to disarm a nuclear warhead, North Korean officers steal the warhead. A South Korean platoon is sent after them to retrieve the nuke, but they both get transported back to 1572 by a time rift. Back in the Chosun Dynasty, the modern-day military officers come face-to-face with a legendary Korean admiral who is fighting foreign invaders. Can the officers find the missing warhead and return to the present?