《"the demons come out of chang'an" is the first song of the "demon series" jointly created by lou's film and television, forest film and television, and beijing youth media. it is directed by yang dongliang and starring yang shihan, yuan zhuo and others. the drama combines western probe and eastern fantasy elements, telling the story of shen you, a young tang dynasty actor, accidentally involved in a series of tortuous and dangerous serial murder cases. in order to find the truth, the careless shen you and the serious and upright dali temple minister wei yingwu formed the "tang version" sherlock holmes and watson. the two of them peeled off their cocoons and opened up layers of fog, and gradually found the fantasy reasoning story of the shocking conspiracy behind them.