In order to prevent unwanted American intervention, a band of patriotic North Korean soldiers steal a nuclear weapon jointly produced with the South. Whilst they are making their escape amid a fierce boat chase and gun battle, a huge comet passes overhead and temporarily blinds them. When they regain their senses, both the Northern patriots and their Southern pursuers find themselves in the middle of another bloody conflict – but this time they are surrounded by ancient warriors on horseback, archers and foot soldiers. The comet has sent them back in time to 1572 – to a key moment in Korean history where a small home force must repel marauding Japanese invaders. The ancient warriors think God has sent his soldiers from heaven to help their cause, but can the warring factions set aside their differences and unite to save their nation?