In Shanghai in 1935, Meng Nianqiao, who had returned from studying abroad, met Fu Shiqian, the owner of a French cake shop, and was attracted by his gentleness and craftsmanship. However, behind the sweet encounter, he is actually an underground resister codenamed "Nightingale". When Nian Qiao discovers Shi Qian's dual identity, she resolutely gets involved in the danger and uses the cake shop as a cover to fight against the enemy. In the raging war, the two composed a love song in troubled times amidst the icing and gunpowder smoke, using sweet disguise to protect the justice of their family and country.
