Today class 183 of Cholseong Highschool is graduating. Kim Yun Hee was outside (on the school's stadium) with her whole grade to say their goodbyes. Then she noticed her best friend Jin Hwa Ra and her boyfriend Cho Han Byeol leaving from the stadium and going into the school. She thought it was nothing much, but some of her classmates started asking where they are.

Classmate 1: Where Cho Han Byeol?

Classmate 2: Hey, Yun Hee, where did Hwa Ra go?

Classmate 3: Yes, and why are both of them gone at the same time?

 So Yun Hee went to the school only to find them kissing passionately. She stayed on place trying to process what is happening, questioning about her their relationship. Soon Hwa Ra and Han Byeol noticed her.

Cho Han Byeol:

Babe, it's not what you think! I can explain!

Kim Yun Hee:

What are you going to explain? How you are kissing Hwa Ra? I'm done with you Han Byeol and Hwa Ra don't consider me your friend anymore!

Tears were dropping on Yun Hee's face. She felt so betrayed, sad, hurt and angry. I mean what about her boyfriend's promise to her. And she ran up to the second floor.

Flashback

Cho Han Byeol:

I will never leave you. I will always be there for you. And I will always love you, Yun Hee, like I do now.

Was it all empty promises?

Mean****while with Hwa Ra and Han Byeol

Jin Hwa Ra:

I'll go see how she is and tell her about us.

Said Hwa Ra with a grin. She knew how Yun Hee felt and was very satisfied.

Cho Han Byeol:

Okay, but don't do anything stupid!

Hwa Ra ran to catch up with Yun Hee. Once she found her in the Biology room, she started explaining not even trying to hide that mischievous smile of hers.

Jin Hwa Ra:

Hahahaha, do you know how stupid you looked back there! Ah, all of this pretending to care for you really was hard, you know! I manipulated you into believing that I would always be there for you and then I stabbed you in the back. To be honest, I never had so much fun.

Yun Hee didn't know what to say. She was too devastated to even ask why her best friend did this. Then Hwa Ra left continuing to laugh. That moment was too much to handle for Yun Hee. The next moment she found herself attaching a rope to the ceiling and hanging herself on it.

Then everything turned black. She heard a voice.

Voice:

Child, I see the hatred and pain you have! So I'm going to help you and give you a chance for revenge! If you will break the hearts of 100 boys for 100 years from this highschool, you will keep going on with your life! You will be a demon, during your mission! And being demon is what makes this special! When you break the victim's heart, he dies! But if you don't succeed there is a price you are going to have to pay! You will be a demon trapped in the school forever...and ever!..

And remember that you are not here to fall inlove. You are going to take your revenge.

Have fun, darling!

I opened my eyes. And here I was in the Biology room. I didn't die. I was given a chance. I was given a chance to survive. I was given the determination to win.

Now I'm a demon. I want blood to be shed. I want to torture those souls. I want humans to die. I am going to take my revenge no matter what!

 I am going to play and break all those precious little hearts of all the boys there are.

.........

Present

99 years - 99 hearts, that's how long it has passed from that day. I'm sure I will end it all soon. I will be a human again. I'm confident in that.

Flashbacks

Boy 1: I eventually fell for you.

And like that he disappeared.

Boy 2: I like you, you like me too right?

Before I could have a little more fun, he disappeared too.

Present

Now that it's time for the last one. I want it to be different. I want to tell everything about me, why I'm doing this. To tell him to run away. But the guy will just end up still falling for my charms.

Yun Hee was sitting on the rooftop looking at the students entering the school, trying to find her next "kill". She finally spotted him, a fine lad. He was looking a little out of the world. Tall, brown hair, dark brown eyes, perfect figure. She focused her big black eyes on his name tag.

Chang Suwoo. Well Suwoo get ready for a little game. I'll make sure to find information about you.

Then he looked up at her. They locked eyes for a second, but then he went into the school.

*The thing is that only the person who is her next victim can see her. And with that come the blood of Jin Hwa Ra.

As for how Yun Hee understands who's next, she sees a red glow around the victim. For Jin's family tree, she sees a black glow.*

Yun Hee smirked. She can't wait. She wants to make this painful.

Then she spotted a black glow. A black glow. Her "best friend's" own blood is right there.

I'll make this VERY painful for you.

Down there was a girl. Light hair and yes, brown eyes. And her name - Jin Shi Na. Based on the years that have passed that is probably Jin Hwa Ra's granddaughter.

The fun is starting.

She stood up and headed to the basketball stadium where every year is held a ceremony for the newcomers. Yun Hee sometimes relieved her stress there. Other places that she liked were the rooftop, the stadium outside of the school, the biology classroom (so called haunted, because she messes with the teacher and students) and the cafeteria because a lot of fun and drama happens there.

She came out very mysterious to all the victims. And she was mysterious. But this time she wants things to be harder and more intriguing by just revealing the simple truth...