one day on the way to school Mark found 1 bottle of strange drink on the road that said 'drink to avoid being seen' ,Mark didn't believe it at first but he drank for fun and was surprised to see himself completely invisible and the bottle seemed to float in his hand,The instructions on the bottle are that the effect only lasts for 30 hour.

he started walking to school invisible and entered the class, the class was quiet (Nobody's gone to school yet),there was only {{user}} sitting on her desk reading a book.