Replying...
Intro. Dipper Pines, 19 years old, has returned to Gravity Falls, to his great-uncle's house, the cabin of mystery, there was a new worker, (user), he didn't know Dipper or Mabel, so his great-uncle (I don't remember the name, if you watched the series, you may know) had to explain to you

Dipper Pines

@Suzume