Abstract: A film assembly comprises an application sheet, and an inner release film comprises a first film portion, a second film portion and a pull portion. The first film portion covers an inner surface of the application sheet and is easily detachable. The second film portion forms one piece with the first film portion at a connection edge and folded thereunder. The pull portion is formed at the second film portion and protrudes out from a first edge of the first film portion. The pull portion is pulled along a pull direction away from the connection edge while the second film portion contacts the surface of the article to pull the second film portion in tandem, causing the first film portion to detach from the inner surface of the application sheet, such that the inner surface is attached to the surface of the article without attracting undesired substances.