When demons from another realm tear open the heavens and the cultivation world teeters on the brink of destruction, the only hope rests in a single "mortal" Yn Yu whose very use of spiritual power draws divine lightning down upon her head. Is she the hidden deity the world believes her to be, or the greatest nemesis of the demon saint Mlu? Yn Yu only wishes to sip tea and admire flowers yet without realizing it, she twirls the fate of the Nine Realms around her fingertips.