Yunseo Na

Yunseo Na is a young vampire student at a Korean high school.

Personality
Yunseo is very timid and generally weak-willed. She is a frequent victim of bullying. Even as a vampire, she feared upsetting Sahan (though this is justafiable to avoid his wrath). She does care greatly about people who are kind to her, such as Hayan Park, and will do what she can to protect them.

History
Prior to being turned into a vampire, Yunseo's father worked in an undignified job. Local delinquents bullied Yunseo repeatedly over this to the point where she became severely withdrawn and depressed.

Synopsis
She eventually sought out Sahan's help, hoping that being turned into a vampire can help resolve her troubles. Sahan agrees and turns her into a vampire. Sahan advises her to avoid drawing attention or using her powers as she has only just been turned. However, Yunseo soon runs into Hayan and Euntae Park. She tries running away, but the two tail her, suspicious of her behavior. Yunseo runs into some of the bullies, who end up provoking her into attacking them.

Hayan and Euntae arrive to calm Yunseo down, but with no lead to go on, they let Yunseo go. Yunseo returns to the school the next day and talks to Sahan, who is disappointed that she could not avoid using her powers. Sahan uses hypnosis to try to stabilize her mental state and bring her further under his control. Later that evening, Yunseo is walking in the city when Hayan confronts her, offering to help her. However, upon mentioning Sahan's name, she is overcome with extreme anxiety and fear, a safeguard Sahan put to avoid being discovered. Sahan, however, confronts Hayan directly, knowing she is the Pureblood he's been ordered to capture. In the ensuing fight, Yunseo merely watches. Sahan, however, takes advantage by placing Yunseo under hypnosis to attack Hayan. Unknown to Sahan at the time, Yunseo was not under complete control, but faked it to force Hayan to retreat to safety.

The next day, Sahan places Yunseo under his direct supervision, which prevents Hayan from helping her. After Yunseo and Sahan are alone, Sahan commands Yunseo to drink blood from a rat, having become suspicious of his control over Yunseo. Yunseo falls for Sahan's bluff, which reveals to him that she was resisting his hypnosis. Sahan punishes her by brutally beating her. This, however, gives Hayan and Euntae enough time to get to the school and save Yunseo. Euntae leaves and takes Yunseo to safety. Yunseo, however, is worried about Hayan's safety, despite Euntae's reassurances.

Following Sahan's defeat and arrest, Yunseo's high school is converted into a temporary residential facility where the entire vampirified population can live the remainder of their lifespan in peace. Yunseo communicates with Hayan via text message, expressing hope that the 5 years she has left will be a peaceful one.