Once upon a time there's a girl named Cristina. She's a quiet and calm girl. But she's unpopular and doesn't have a lot of friends. She just read books in her house. Her parents are out of town to visit her another siblings from another town. One day, Cristina was walking in the street towards her house. After a few minutes of walking. She finally arrived, she unlocks the door of her house with a key. Once she opened the door. She was shocked to see a stranger in her house.

Cristina: Who.