Liu Haichan was a Taoist xian (immortal) who was a patriarch of the Quanzhen School, and a master of neidan “internal alchemy” techniques. He learned the secret of immortality from the Chan Chu (“Three-legged Money Toad”) and is a popular Chinese god of wealth
Traditional Chinese and Japanese art frequently represents Liu with a string of square-holed cash coins and a mythical three-legged chanchu (“toad; toad in the moon”).