'Woo-Yeon,' descendant of Bear Tribe. 'Tae-Geon,' descendant of Sheep Tribe. 'Do-Ha,' descendant of Tiger Tribe. 'Si-Hoo,' descendant of Snake Tribe. 'Soo-Hyun,' descendant of Dragon Tribe. As they were all 'God's descendants,' they found that people, who had suddenly disappeared from the late Goryeo Dynasty, returned to Earth on December 20, 2020. They didn't know who those people were or why they all came back suddenly, but if they didn't harm humans, they wanted to help them settle down and live on the Earth. However, as it turned out that a series of murders were related to those who had returned to Earth, they began to find them as priests. There was 'Kay,' a super sexy singer, who kept bumping into each other at the crime scene. Who was she?