u/Expensive-Release606

Teen fantasy live-action movie from Netflix (2010s). A boy at a dance is told by his friend to say ‘I’m the one you’ve been looking for’ to a girl. She gets excited because she thinks he is the chosen caretaker for a humanoid beast/creature she keeps in an old mansion. He later discovers she was serious, but eventually he really is the chosen one. The girl has brown hair, wears long dresses, and the Netflix poster showed her in a green dress