Dahyun, a girl who lost her memory and her parents after the car accident. She forget everything about herself and also her friends but the only thing she remember is two boys who is name Jackson and Bambam but she doesn't knows what are the relationship between them so she have to find out things between them with the help of her sister Taeyeon and her brother Taehyung.

Dahyun and Jackson are childhood bestfriend for more than 10 years already. Aside from being childhood bestfriends, they are also neighbors and studies at the same school. Not to mention that she has a huge crush on Jackson unfortunately, while Dahyun was a away for a year and came back to seoul, Jackson had a girlfriend, Youngji who is actually Dahyun's bestfriend which had her hopes crush. Jackson treats Dahyun as her little sister *SIBLING ZONED* mean while, Dahyun is secretly getting jealous and angry of the fact that Jackson's so oblivious. Will Dahyun continue to like him and get hurt secretly or will Jackson finally finds out that she likes him or will he say sorry after finding out that she likes him?

Dahyun changes to a whole new person. She moves to Ilsan and enroll into a new high school. She doesn't smile. She doesn't laugh. She only does that around her mother, her best friend, Lisa and her sister, Jennie. Her father didn't come along because of work. He visits once or twice but never really stay with them. Dahyun and Lisa fitted just right, in their new school. Its more like they fit themselves in whether people like it or not. They don't have problems with innocent students. They only have problems with the ones who disturbs them. But what makes Dahyun's heart soft is, she meets with a guy who reminded her of Mark.

Dahyun had an accident and got an amnesia. So she just remembers her parents and her friends who she knew from two years before the accident happened. Dahyun's best friends hide something from her but she didn't notice it. She tried but she couldn't remember what happened. Until a guy came back to her life and confessed. And his name is Mark Tuan.

Kim Dahyun-Smart,Intelligent, Humble,Has a crush on Mark Tuan Mark Tuan-A little bit smart,school's kingka, Has a crush on Dahyun Minatozaki Sana-Smart,Humble,Dahyun's Best friend,Has a crush on Jackson

JYP High School, despite its popularity for having successful students, it's also popular for having delinquents. The unnatural balance between good and bad students makes it awkwardly a famous school attended by most of the students in Korea either angel-like or devil-like teenagers. An 18 years old girl, Kim Dahyun who was an unnecessary delinquent, who liked to play truant a lot always become the target of the bullies in her class which she found so annoying to deal with. Though they never feel tired to irritate Dahyun, Dahyun never paid attention to their action as she is always punctual to her truancy and nothing matters more than that. A big surprise to everyone, Dahyun actually had a twin sister who lived in their hometown together with their grandmother who had recently passed away. So, her twin sister was brought to Seoul and went to the same school as Dahyun. More surprises to that, her twin sister was actually the infamous bully, Kim Dahye at her former school and words about her had spread even before she came to Dahyun's school. Anyone who was in their right mind might not want to have anything to deal with the twins except for the desperate bullies who wanted to non-essentially prove their power in the school. Though once again got ignored by the twins as the delinquent Kim Dahyun still sticks with her playing truant and Kim Dahye wanted to stop being a bully and followed her twin sister's step. Being a bad girl doesn't mean they can't be a good girl, in which their friendship was saved by the notorious twins.

Although I couldn't say it all, I'll miss you cause I love you so much. Even though this is a goodbye, I'm not far away. I'm forever in your heart. - Im Jaebum, Forever Love. The only things she could do is . . . . . cry.

Kim Dahyun, hanyalah remaja biasa yang suka menghabiskan harta ayahnya. Ibunya sudah lama meninggal, sehingga kehidupan gadis ini sedikit bebas dan susah diatur. Apalagi, sang ayah begitu memanjakannya dan selalu menuruti semua keinginannya. Hingga suatu ketika, sang Ayah menikah lagi dengan seorang wanita cantik, yang menurut Dahyun umurnya tidak jauh berbeda dengannya. Dahyun, tentu tak menyetujuinya. Perjalanan hidup Dahyun begitu berat ketika tiba-tiba dia sering tertidur dengan sendirinya. Dan suatu ketika ia bertemu dengan 7 vampire (Mark Tuan, Im Jaebum, Wang Jackson, Park Jinyoung, Choi Youngjae, Bambam dan Kim Yugyeom)

"Only you"

"Letting go means to come to the realization that some people are a part of your history, but not a part of your destiny."