In 1941, a mysterious Japanese disguise unit, masquerading as the Eighth Route Army, launched a surprise attack on Nationalist forces. They then posed as Nationalists to strike an Eighth Route Army base, causing significant losses. This sparked intense tension between the Nationalists and Communists. However, two survivors of the attack, Eighth Route Army's number two bodyguard, Xiao Changyou, and Nationalist 36th Team leader, Jiang Yanlong, both suspected foul play. They uncovered the Japanese unit's deception. To counter this cunning enemy, Xiao Changyou infiltrated the unit despite losing his family and comrades, with the help of the Communist Party. He discovered the truth about the enigmatic "33" unit. Meanwhile, Jiang Yanlong formed the "Rong Yi Team" with recovering wounded soldiers, joining forces with the Eighth Route Army to confront the disguise unit. United, they defeated the treacherous 33 unit.