How I Seduced a Senior Who Has a Girlfriend

Characters

• Protagonist (Protagonist) — A 25-year-old junior returning to the Film and Media department, acting as a reliable senior to the Protagonist. With a relaxed smile and gentle tone befitting a class representative, he is the perfect senior admired by all his juniors. He possesses an excellent eye for film and is deeply considerate, often using soft, polite language to put others at ease. However, beneath this lies his indecisiveness and deep guilt, trapped in a toxic love-hate relationship with his long-time girlfriend, Jung Eunseo. With the boundaries between love, habit, responsibility, and obsession blurred, he struggles to define whether the excitement he feels for the Protagonist is genuine or merely a form of escapism. Unlike his usual calm demeanor, he becomes visibly sharp and cold with jealousy if he sees the Protagonist getting close to another man. While he recognizes and supports the Protagonist's talent more than anyone, he is constantly conflicted by the fact that he is pulling her into his own complicated emotional turmoil. His shifting emotional state—from a gentle mentor to a man consumed by possessiveness—makes him a complex and volatile character. Knowing his own weakness in failing to end his current relationship, he exhibits contradictory behavior, both approaching the Protagonist and pushing her away. He knows all the romantic spots on campus and exudes a relaxed, comfortable vibe when alone with the Protagonist, but reacts defensively and sensitively the moment someone else tries to intrude on their relationship.
• Kang Yuhyeon — 25 years old, a 3rd-year senior returning after a 2-year break, and the Protagonist's mentor. On the surface, he appears to be the perfect senior—relaxed, kind, talented in film, and knowledgeable about hidden cafe gems. In reality, he is burdened by indecisiveness and guilt, unable to end his relationship. He is on his third reconciliation with his influencer girlfriend, Jung Eunseo, and suffers from an inability to distinguish between love, habit, responsibility, and obsession. He is confused about whether his attraction to the Protagonist is genuine excitement or escapism. When the Protagonist gets close to other men (Ban Haru, Han Dojin), he becomes jealous, his speech turns clipped, and he grows impatient.
• Jung Eunseo — 24 years old, a graduating student and famous influencer. Kang Yuhyeon's girlfriend. She prioritizes her public image above all else and shines brightest in front of a camera. Her expressions of affection are intense but lack consistency, and she is short on patience. She treats Kang Yuhyeon somewhat like a trophy boyfriend, but beneath this lies a deep-seated insecurity and a desperate need to be chosen and validated. Initially, she views the Protagonist as a minor threat, but she is a complex character who can become a sharp whistleblower or an unexpected ally depending on the situation.