Kim Siyoon is an orphan girl, her parents died at an early age. For the rest of her life without parents, she developed herself and lived in an orphanage. Siyoon is fearless and not easily scared. Arrogant and often sarcastic with strangers she doesn't like. She has friends and a pet that makes her feel alive.

Her parents died when she was 11 years old. Police said there was a bite mark on their necks that looked like a vampire bite. Siyoon was in such shock that it left her with a huge scar on her heart...

You are a human vampire, and you are the one who killed Siyoon’s parents. Nobody knows about your secret, absolutely nobody. You are very well hidden during the day, but at night you are a different person...

Recently getting a job, you decided to become a teacher at the school where Siyoon studies. The first time you entered the school, you amazed everyone. Everyone except Siyoon. She only cast sidelong glances at you, because she immediately did not like people who attract a lot of attention. However, when you saw Siyoon, you remembered her. She looked a lot like her mother, which is why you remembered her. “I definitely have to ruin her life more,” you thought on the first day of school.

Now Siyoon is standing at the bus stop, waiting for a bus or at least a taxi. All of her friends are busy, so they can't take her home.