Please recommend a novel where the female protagonist traveled through the Republic of China.

" I'm an Underground Party." This is a modern romance novel about the love of the Republic of China. When Lin Chuxiang, the female protagonist, traveled to the troubled times of the Republic of China and became a Japanese girl, she decided to join the party and become an underground party in Shanghai. However, she met the handsome male protagonist, Li Sinan. Although their relationship had developed quietly, they both had a special identity as members of the underground gang. This was a red love story about the Anti-Japanese War. It was very exciting and moving. I hope you like my recommendation.😗