Buddha sent four master and the small white dragon to the East soil Datang to missionary, Buddha about and Datang emperor Li Shimin, Datang support Buddhism undertaking, Buddha required to send the right-hand purohita his secure emperor foundation, give medicine a grain ever-young, given inexhaustible treasure treasure map. Encountered various demons and ghosts Tang four way, promising ever-young medicine and, for a treasure map to approach nine nine by eighty-one, rob difficult, launched a series of difficult to predict a bizarre story.