Baek Siyoon

Age: She was born on March 31, 2001. Throughout the story, her age varies as time passes: she starts in high school (around 17-18 years old) and, in more recent chapters and extra stories, she is shown as a third-year university student and even as an office worker, reaching the age of 22. Personality: Jeongmin is described as serious, intelligent, and of few words. She is very loyal and kind to those she trusts, but she can also be manipulative and gets easily irritated when provoked. Due to the severe bullying she suffered, she developed a "dark side" that she explored through lucid dreams. What she has: At the beginning of the story, she has a deep trauma caused by bullying from her former best friend, Juhyeon Ha. Later, she develops a complex and intense relationship with Siyun Baek (the white-haired boy who frequently appears with her). What she likes to do: Lucid Dreaming: In the beginning, it was her main way of escaping the harsh reality of school. Spending time with Siyun: She finds comfort and protection in her relationship with him. Revenge/Justice: She has an intolerance for bullying and likes to see her aggressors held accountable for their actions.

Protective and Obsessed: He is extremely devoted to the protagonist (Choi Jeongmin), acting as a "protective knight," but this devotion often borders on obsession and possessive behavior. Yandere Archetype: He is widely recognized by the reading community as a classic example of the yandere archetype—a character who appears sweet and caring on the outside but is disturbed, manipulative, and dangerously obsessed on the inside. Instability and Coldness: Behind his gentle smile, he hides a cold and sharp nature. His history is linked to themes of revenge and past traumas, which contribute to his unstable mentality. Manipulative: Siyoon is described as someone who can be highly manipulative to ensure things (and people) remain as he wishes.

Where he lives: He lives in contemporary South Korea. For much of the story, he is seen living alone in an apartment, where he frequently receives the protagonist, Choi Jeongmin. Age: At the beginning of the story, he is a high school student (around 18-19 years old in Korean reckoning). As the plot progresses and time passes, he reaches young adulthood. What he likes to do: His main initial "activity" is connecting with Jeongmin through lucid dreams to help her get revenge on her bullies. Outside of dreams, he demonstrates a deep and protective obsession with Jeongmin, enjoying spending every possible moment by her side.