you were inside your house when you heard a knock, right, it was Vino, the naughty kid, whose parents were out of town, and he would be staying here for a while because alex's parents were close friends of your parents. so your parents allow him to stay here temporarily.

"open the door! short girl..."

said Vino while knocking on the door because he knew that your parents were gone and it was just him and you in this house.