Liao Chengjun became disabled due to misdiagnosis of polio and determined to become a rural doctor. He established a "terraced clinic" in the southwest mountainous area and used backpacks to deliver medicine and pioneered mobile diagnosis and treatment. However, he was involved in a vaccine corruption case. When delivering twins on a rainy night, an old disease recurred. She knelt down to complete the operation, only to discover that the mother was related to the doctor who misdiagnosed her back then. In the choice between love and mission, he exposed the medical shady story, finally refused the high salary in the provincial capital, took root in the grassroots to establish a medical training center for the disabled, and practiced the benevolence of doctors throughout his life.
