Lin Xiao, Gu Li, Nan Xiang, Tang Wanru – these four best friends, after waving goodbye to their school campus and entering the workforce, they are faced with various challenges in their life: friendship, love, and career. Together, they become lost in life, having long forgotten their past courage.

A former spy in the Chinese Nationalist Party falls for an opium-dealing widow, as China is ravaged by war and revolution.