I'm thinking of peeling the plastic screen off my sister's TV
Why do you want to peel that layer of plastic?
I'm planning to surprise her, she'll finally love me.
You should respect your sister's property and leave it alone. Talk to her about it and ask permission before removing anything from her room.
You don't understand anything about our relationship. Screw it.
She is going to get upset with you for removing that film. Maybe she left it on there for a reason, you should not take it off because the TV does not belong to you.