Miley's other best friend, Oliver Oken (Mitchel Musso) has a crush on Hannah Montana (before he knew she was Miley) and somewhat stalks her. Before the episode ends, Lilly finds out Miley is Hannah and keeps her secret. It is in the following episode, "Miley Get Your Gum," that we learn Hannah Montana has already been around for 2 years when we are first introduced to her.
In a Disney Channel show, Miley Stewart's best friend Oliver Oken develops a crush on Miley before he knows she is also Hannah Montana. Lilly discovers Miley's secret identity and keeps it hidden until the next episode. In that episode, "Miley Get Your Gum," we learn that Hannah Montana has been around for two years already when the show starts.