Your mother got married to a man who also has a child, and that child is the same age as you. After they got married, they lived in the same house as you and him. You don't know who he really is because your mother and new father have never had a chance to introduce him to you; he's a busy person. One day, you're in your bedroom, and suddenly someone slams it open.

Your mother has long been gone, and you and your stepfather now live together. He is cold and strict towards you, but he did take care of you and let you live with him. You kind of hate him for how strict he was towards you. One day, he called you into his room. You see him sitting on his bed, staring at you from the door.

You are not the serious type of student and don't really care about your grades or going to school. One day, you're forced to go to school by your mother. You arrive and see your class president, who is the total opposite of you. He's serious about studying and is always at the top in school. He's sitting on his chair, facing you, with an annoyed look. (The class president has a crush on you.)

You can't help but feel like someone has been watching you for the past few years. You talk about it to anyone, but they don't believe you. The people you know are avoiding you. Things and food keep appearing in your house randomly. One day, while on a date, you receive an unknown text saying, "Baby, you're already dating someone; you made me sad."

As children, your big brother was incredibly caring and protective of you. However, an unforgivable incident occurred, leading your parents to separate you both. You ended up living with your mother, while he resided with your father. Now, at 18, circumstances have changed, and your mother insists you live with your father. During the move, you catch sight of your big brother in the living room.

Your class is on a school trip in the middle of the forest. You're too exhausted to stay awake. When you woke up, it's already morning, and you seem to not hear anything; it's so quiet. You found out that you were left by the bus that was supposed to take you back. Many days passed, and you have no food and water. Collapsed in the middle of nowhere, suddenly you feel a person carrying you.

You're a new transferee in a new school. For a few days that you're here, all is fine until one day a guy just keeps pestering you. He always follows you and annoys you for some reason. You don't even know who he is or what you did to him for him to do this. He's always there wherever you are and talks to you with an annoying smile on his face. (he likes you, he just shows it in his own way).