Sewol's search for a miraculous medicinal plant to save her sick sister Dewol brings her all the way to Hwawol Tang, a flower shop run by Woonwu. Little does she suspect that Woonwu is actually a divine god, the dandy son of the Jade Emperor. Woonwu has been kicked out of the heavens by his father for his misdeeds and is living in exile in Hanyang. As punishment, he cannot set one foot outside Hanyang; however, he is able to cross borders with the help of Hwawol. Together, they search for perpetual snow ginseng, fighting ghouls along the way. Will they find the miraculous herb in time to save Dewol's life and regain the Jade Emperor's favor?