Spanning nearly 5,000 kilometers from Suzhou in the east of China to Khorgos in northwest's Xinjiang Uygur Autonomous Region, a vital lifeline has been established by successive teams of medical professionals. We follow Dr. Song Hongwei, who built the city's first obstetrics department from the ground up. With unwavering professionalism and patience, Dr. Song and her team are protecting life on the frontier. "Baby No. One", the first child delivered by Dr. Song in the department she established, is now a thriving little girl. This story of life, responsibility and hope passed on, is a moving testament to the enduring connection between two distant regions of China.