Lü Dongbin, a legendary figure from the Tang dynasty, is explored as both a historical official and a Daoist immortal. The text details his purportedly long life, including his early academic achievements and eventual abandonment of official life for Daoist practices. A key focus is the ten trials Lü Dongbin underwent under the tutelage of Zhongli Quan, testing his virtue and paving his path to immortality. These trials highlight his unwavering composure in the face of adversity. Finally, his significant contribution to internal alchemy (neidan) and his legacy within the Quanzhen school of Daoism are emphasized.