Li Ji, a military academy graduate, accidentally joined the "Beauty Snake" group of the Military Control Commission and performed undercover missions in Shanghai. With his "God-level Disguise" golden finger, he successively disguised himself as a Japanese major and a member of the Green Gang, completing tasks such as assassinating pro-Japanese factions and rescuing senior officials. When the Japanese army landed in Hangzhou Bay and Shanghai fell completely, Li Ji lurked in the Special Agent Section of the Japanese Military Police Headquarters, using the alias "Aikawa Shixiong" to deal with the Special High Section and traitors.