Set against the backdrop of the Second Sino-Japanese War and the Wang Jingwei puppet regime, 'The Disguiser' follows the intricate lives of the prominent Ming family in Shanghai. Ming Tai, a carefree university student, is abducted by the Kuomintang military intelligence and trained as an elite spy. Unbeknownst to him, his eldest brother Ming Lou operates as a triple agent working for the Chinese Communist Party, the Kuomintang, and the Japanese invaders, while his older sister Ming Jing secretly funds the resistance. As the siblings navigate a labyrinth of espionage, deception, and shifting loyalties, they must conceal their true identities not only from their enemies but sometimes from one another. The series explores themes of patriotism, familial sacrifice, and the heavy psychological toll of war. Ming Tai evolves from a naive youth into a lethal operative, ultimately finding his true calling in the underground communist movement alongside his dedicated partner, Yu Manli.