Jihye was a girl who have 6 half-blood brothers. Her mother died after giving birth to her. Hence, she always blamed herself for killing her mother. That's the reason why she is living with her grandmother now. She's quiet, weak and she thinks she's a burden to everyone. 

Her 6 half-blood brothers : Boyfriend. All of them are half-brothers too.

Donghyun : The eldest half-brother. Cool and handsome. 

Hyunseong : The second eldest half-brother. Quiet and cold.

Jungmin : The third eldest half-brother. Mysterious. 

Youngmin : The fourth eldest half-brother. Clever-looking.

Kwangmin : The fifth eldest half-brother. Looks like a character from a manga.

Minwoo : The youngest half-brother. Scary but warm.

Her half-blood related brothers always acted like they don't care about her and wished she weren't here, but, inside them, they care about her a lot and wished she were there beside them. 

Because Jihye and they are known as brothers and sisters to the public, the 6 brothers of hers couldn't show their real feelings to Jihye.

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Jihye's life was already very miserable for herself. She didn't want to live with her father and brothers because she felt like a burden to them.

Jihye and her grandmother is poor so she always work part-time for pocket money.

Then, the worst thing in her life happened,

Her Grandmother Died..

So she had to live with her brothers and father. 

Uh-oh, That isn't really the worst thing. The worst is,

She Met A Car Accident.

She died. But someone brought Jihye back. So now, Jihye is living as a Dark Angel, 

Jihye's dead but she's still alive in people's eyes. Jihye is not allowed to tell anybody about the Dark Angel tales.

During the time as a Dark Angel, everything changed. 

In what way? Read to find out.