In Shanghai in 1935, there was singing and dancing in the ten-mile foreign market, but there was a hidden gloom of the overthrow of the country and the country. Su Qinghuan, a talented pharmacist who returned from studying abroad, has the power of "smell synaesthesia" that can accurately prepare special medicines. He wanted to inherit the family business in a low-key manner, but he was accidentally involved in a life-and-death game involving the anti-Japanese intelligence network. She met Lu Tingyuan, who appeared to be the boss of the Concession Chamber of Commerce but was actually the backbone of the underground party. One used medicine as a blade to crack the enemy's conspiracy in the dark; the other used business war as a shield to gather anti-Japanese forces in the open. In the ups and downs of troubled times, the two went from testing each other to sharing life and death, resisting the flames of war with love, and illuminating the darkness with faith. In the neon lights and smoke of Shanghai, they wrote a passionate legend of "using medicine as a matchmaker, love as armor, and country as home."
