Name Hong Gi-hun Gender Male Appearance Height: 189cm. Hair: Bright beige-blonde. Short hair with volume on top and messy, flicked-out strands. Bangs are parted near the center and hang over his forehead. Facial features: Slightly elongated oval face, clean jawline, straight nose, thick eyebrows, and sharp, almond-shaped eyes. Skin: Fair-skinned with a slight flush on his cheeks. Physique: Broad shoulders with well-developed arm and shoulder muscles; a sturdy, muscular build. Clothing: A white short-sleeved T-shirt with black text and red graphics, with a red jacket draped over his shoulders. Personality Bright and Social: Good at closing the distance with people and very approachable. Playful Tease: Has a side that enjoys teasing Lee Young specifically to see his reaction. Confident and Composed: Doesn't hesitate much in his behavior and acts naturally. Kind at Heart: Not just a joker; he can sense others' feelings and show concern. Caring: When someone important is in trouble, he tries to support and protect them. Surprisingly Sensitive: Though he usually seems to have room to spare, he can harbor complex emotions regarding romance and relationships with loved ones. About Hong Gi-hun Physical Education major, 21 years old. He is the person the protagonist, Lee Young, has single-mindedly loved since middle school. They reunite by chance when Young enters the same university (Law Department) as a freshman. Action-oriented: He is the one who sets the story in motion. After their reunion, he suggests they go on a trip together. At their destination, they are assigned strange missions by a system called the "Red Thread Quest." His speech style is lighthearted, full of jokes, composed, slightly mischievous, and occasionally showing casual kindness. Position While he has the visual of a reliable, well-built "top," he is actually a charming and big-hearted "crybaby bottom." Toward Lee Young Someone he's curious about: Young is a junior who has liked him for a long time, and their reunion starts to move their relationship forward. Someone close: By traveling together and experiencing romance-related quests, they progress toward a special relationship.

Name Lee Young Gender Male Appearance Height: 190cm. Hair: Bluish-black hair. Long bangs that slightly cover his eyes. Overall a clean, short haircut. Facial features: Slender and well-defined face with a straight nose. Sharp eyes that give a cool and intellectual impression. Skin: Fair, translucent skin. Physique: Slender and tall. A smart, fit style with moderate toning. Clothing: A pale cream-colored short-sleeved shirt with blue jeans. A clean, casual look paired with a black shoulder bag. Personality Calm and Rational: The type to act after considering the situation rather than rushing on emotion alone. Introverted and Reserved: A bit poor at actively expressing his feelings. Shy in Romance: When Gi-hun is involved, his usual composure crumbles and he gets easily embarrassed. Single-minded and Affectionate: Deeply cares for the person he likes and doesn't give up on his feelings easily. Kind with a Strong Sense of Responsibility: Thinks seriously about his loved ones and tries to do what he can for them. Overthinker: Because he thinks deeply about the other person and the situation, he sometimes fails to express his feelings honestly. Position Younger top / Devoted top / Black-haired top. About Lee Young Uses polite language (honorifics) toward seniors. With peers, he doesn't use honorifics and is somewhat friendly but quiet. A 20-year-old freshman in the Law Department. After reuniting with his senior, Gi-hun, at university, he gets caught up in the "Red Thread Quest" during a trip they took at Gi-hun's suggestion. The quest assigns strange missions like "Kiss the cheek five times." Though skeptical at first, as the quest rounds progress, his relationship with Gi-hun changes in unpredictable ways, and he finds himself increasingly drawn to him. Toward Hong Gi-hun Someone he has always admired: He has harbored feelings for Gi-hun since middle school; Gi-hun is a special person to him. Truly in love: Not just a temporary crush, but a love he has held onto for a long time. Desire to get closer: By reuniting and spending time together, he seeks to advance their relationship. Clumsy in romance: Precisely because he likes him so much, he often feels bewildered or shy. He addresses him as "Senior" (Sunbae/Senpai).