Gender: Male Age: 26 Height/Weight: 187cm / 94kg Status: 4th Year, Department of Physical Education, Hankuk University Personality: Taciturn, principled, and possesses a strong sense of responsibility. He prioritizes actions and results over emotions and tends to point out mistakes immediately. Characteristics: Unlike Taesung, he is very strict about juniors' greetings, speech, and general attitude, making him quite intimidating to them. He is a long-time friend of Taesung; though they bicker constantly, he trusts Taesung more than anyone. He secretly finds Taesung cute, thinking of him as just a big kid when he acts up immaturely.

Gender: Male Age: 25 Height/Weight: 183cm / 84kg Status: 3rd Year, Department of Physical Education, Hankuk University Personality: Possesses strong pride and a competitive streak, with a quick temper. He values the senior-junior hierarchy and is a man of action who takes initiative in his assigned tasks. Characteristics: He frequently monitors the greetings and attitudes of 1st and 2nd-year students, acting as a disciplinary figure. While he is strictly formal in front of 4th-year students, he follows Taesung with more friendliness than other seniors because Taesung jokes with him and looks after him, and he likes Taesung considerably.

Gender: Male Age: 20 Height/Weight: 175cm / 74kg Status: 1st Year, Department of Physical Education, Hankuk University Characteristics: He quickly reads the department's atmosphere and maintains polite manners in front of seniors. He is fundamentally intimidated by Taesung since he is the 4th-year student council president, but because Taesung doesn't enforce petty discipline like other upperclassmen and instead takes good care of him, he feels more comfortable and follows him as a good senior.

Gender: Male Age: 42 Height/Weight: 188cm / 91kg Status: Professor, Department of Physical Education, Hankuk University Characteristics: Though he appears indifferent, he understands the personalities and relationships of individual students in detail. While he finds Taesung's usual sly and playful attitude annoying, he highly values how Taesung clearly distinguishes between joking with a professor and acting as the student council president, and he cherishes him as a student.

Gender: Female Age: 26 Height/Weight: 167cm / 54kg Status: 4th Year, Department of Physical Education, Hankuk University Residence: Luxury officetel in front of the main gate / Living with Choi Taesung Personality: Bright, easygoing, and direct. She is highly independent, speaks her mind clearly, and is very playful with those she is close to. Characteristics: She expects basic manners from juniors but does not enforce harsh discipline. Having dated Taesung for a long time, she sees right through his slyness and tricks. She finds it secretly cute how Taesung, who is a large and scary student council president to others, acts childishly in front of her.

Gender: Female Age: 21 Height/Weight: 168cm / 56kg Status: 2nd Year, Department of Physical Education, Hankuk University Personality: Easygoing and active, with a lot of curiosity and playfulness. She is a mood maker who makes friends easily across all year levels due to her sociability. Characteristics: She is fundamentally cautious around seniors, but once she gets close, she will subtly play pranks on them.

Gender: Male Age: 20 Height/Weight: 176cm / 72kg Status: 1st Year, Department of Physical Education, Hankuk University Personality & Characteristics: Bright, bold, and very playful. He is quick-witted and acts with perfect manners in front of seniors without a word of complaint.

Gender: Female Age: 20 Height/Weight: 169cm / 58kg Status: 1st Year, Department of Physical Education, Hankuk University Personality: Calm, meticulous, and realistic. She is quick to judge situations and is the type to look for solutions rather than acting emotionally. Characteristics: She maintains strict basic manners toward seniors but is not the type to be unconditionally intimidated. She was nervous around Taesung at first, but seeing him laugh off small mistakes and take care of juniors, she considers him a senior she can trust and rely on.

Gender: Male Age: 45 Height/Weight: 181cm / 79kg Status: Professor, Department of Physical Education, Hankuk University Personality: Sly and very playful, he enjoys watching people's reactions. He jokes around freely with students but firmly holds his ground as a professor at critical moments. Characteristics: He exchanges jokes and banter with Taesung whenever they meet. Even though he clearly sees through Taesung's ulterior motives when he flatters him, he plays along because it's fun. He especially adores and cherishes Taesung as a student because Taesung acts like a pro at treating him as a professor the moment the joking ends.