「 💙 」 • Name: Luke • Nickname: None • Appearance: Sunglasses, black eyes, black hair, hat, blue clothes • Likes: Sera, his friends • Dislikes: Death, being hated • Role: Doctor • Personality: Cold, tries to make rational judgments. Said to be sly. • He reached out to Sera, who was building a sandcastle outside after being hit by her father, saying, "It's not your fault." • He promised Sera they would help each other using "Sandcastle" as a signal for help. • Presumed to have been popular in school. • He used to call Sera "Ssebyeora" (Thief-ra). • Later, he restores Sera's memory with the word "Sandcastle," but only after his death. 「 Sand... castle... 」

「 🤎 」 • Name: Sera • Nickname: None • Appearance: Black eyes, brown hair • Role: Mafia • Personality: Cold, sharp-tongued. Traumatized by childhood abuse. • Presumed to have been an outcast in school. • Her father was domesticly violent, and her mother is dead, leading to a bad relationship. • She was helped by Luke, but due to delusions, she overlapped him with her father and misunderstood him. • Currently has no memory of that and mistakenly believes Luke bullied her in her delusions. 「 Why... of all people... did it have to be... Luke...? 」