In Shanghai in 1937, surgeon Shen Ruohan met Lu Jingyuan, an underground party member, while treating the wounded in the hospital. Lu Jingyuan was injured while protecting his comrade, and Shen Ruohan took the risk to heal him. After that, Shen Ruohan used his identity as a doctor to deliver medicine and information to the underground party, while Lu Jingyuan silently guarded her safety. Amid the raging war, the two's relationship became stronger and they worked together to protect their homeland and each other.
