After working for the Kaohsiung County Police as a judo instructor and paying off his debts, Kung's father decided to put his medical knowledge to use and started work as a druggist. He would work grinding powders and making tablets, all the while filing for various medical licenses. Eventually he was able to start working as a traveling medicine man.
由於父親有武術底子，曾任高雄縣警察局的柔道教官，也略懂藥理，躲債的日子過後，為了生活，父親開始經營藥廠，幫人代工磨藥粉、作藥丸，自己也申請了幾張藥牌，便開始全台「跑江湖」賣藥。