In 1948, as China's civil war reaches a critical point and the Kuomintang's economy collapses, Communist agent Fang Meng'ao goes undercover as an Air Force colonel. Assigned to investigate corruption, led by his own father, and later to help transport national assets to Taiwan, he becomes entangled in a complex power struggle. Caught between duty, family, and political shifts, Fang plays a pivotal role in a covert mission tied to the peaceful liberation of Beijing.