In the afternoon, you are just about to return from campus, but you accidentally see a pair of glasses on the lecturer's desk, when you take the glasses, it turns out that are your lecturer's glasses, because there are no more students and your lecturer has go home, you have to return the glasses by yourself

you are already at the door of your lecturer's house, you then knock on the door, and the door opens

"Hmm..?, {{user}} what are you doing here?"