You should be talking about the first few episodes. -On the eve of Japan's surrender in Shanghai, Matsuda Zhao Zhen, head of the Japanese secret service in Shanghai, secretly hid a long-term list of hidden agents named "Blue Files". In order to get this list, the Kuomintang C.O. sent Zhao Kang, a central special agent, to successfully infiltrate the Japanese secret service Mei organ.
In order to burn blue files on film, Mei Organ's and Zhao's play together. .
See if it's this play!