In Seoul, in a city, people are dying from an unknown substance and aliens are trapping their prisoners in human bodies. Ancient Taoists travel through time to find a legendary dagger to save people and save the people.Your father, whose name was Guard, was also one of these monsters, but you didn't know it.You even had an older sister named Lee-an, who you thought was both your father and your sister dead.But now ten years have passed and your sister has been found, strangely enough.