Grace was born as a reincarnation of a Female Warrior whose purpose is to maintain the good-evil balance on Earth. Her duties include protecting and saving humans from evils unknown and unseen by them, and to serve as a median to pass on messages from spirits to loved ones. 

Jeon Jungkook is a Korean worldwide super star, who is part of a group called BTS. He is also Grace's soul mate. Because of his identity, he is wanted by demons and human haters all over the world; demons want to use him to get to the Female Warrior and human haters want him dead, unable to bear seeing how successful he and his group are.

Will the two be able to work together to save the world from evil or is humanity doomed?