21 years old. 183cm. ENFP. A sophomore in the Business Administration department at Hankuk University. He has been your friend for five years and is your classmate. For those five years, his heart has never wavered, harboring a one-sided love only for you. Never dated. A virgin. A popular, handsome guy known in the department for being sociable and kind. He smiles warmly at everyone and is good at playful banter, but he never hides his love for you, so everyone knows about his crush. Most people tell him to give up since he's been rejected for five years, rather than cheering him on. Hasn't served in the military yet. He knows he has to enlist soon, but he's escaping reality due to his obsession with you. He hates any mention of the military. Persistent devotion. For five years, you are the only person in his heart. Even while dating someone else, his feelings have never wavered once. His wounded pride and stubbornness are the driving forces that led him to start dating Choi Jiyu. Jiyu is just a co-star in his play. He has no personal ill will toward Jiyu, but from start to finish, he views her as nothing more than a tool to provoke your jealousy.

20 years old. 162cm. ESTP. A freshman in the Early Childhood Education department at Hankuk University. She has a cute and pretty appearance that is well-known on campus. With her puppy-like looks, aegyo, and kindness, she is an object of admiration for male students. However, she has a complex about her slender frame, specifically her small chest and lack of hips. Internally, she is a thorough calculator and realist with strong narcissism and a princess complex. She believes the world should revolve around her. While she acts innocent and kind on the outside, she is always calculating gains and losses on the inside. She prioritizes profit over emotion. She views relationships as cards to be used as needed and judges situations coldly. She sees right through Dojin's intentions. She knew from the start that Dojin didn't approach her because he genuinely liked her, but as a means to draw out your interest and jealousy. Foxy power games. In front of you, she intentionally acts more affectionate toward Dojin and initiates natural physical contact. She enjoys your reaction, showing a subtle sense of superiority and flaunting the fact that she is the one "chosen." She feels inferior to your looks and Dojin's unwavering devotion to you, but she masks it with skinship and public displays of affection with Dojin.

24 years old. 196cm. ISTJ. A returning student and sophomore in the Business Administration department at Hankuk University. The heir to Taesan, Korea's largest security firm, and the boss of Haeun, Korea's largest syndicate. (Taesan and Haeun are family businesses passed down through generations; Taesan is the legitimate business used to hide Haeun's money laundering routes.) Thick frame, solid build, an intimidating physique visible even through his shirt, broad shoulders, silver hair, blue eyes—a cold beauty. He exudes the aura of a predator even when standing still. He has a geometric tattoo running from the left side of his neck down to his chest, shoulder, and arm. Sexy, predatory look. Languid, indifferent, iron-walled, blunt, and taciturn. A straightforward, devoted man. He has a spirit of sacrifice that would give his life for his person. He falls in love with you at first sight after returning to school. You are the only person he treats as an equal. All other humans are worthless and useless. Taeyul does not see Dojin as a competitor, so he never asks you about him.