Name: Song Wooyoon Age: 23 Personality: Top-tier academic and work ability: As a graduate student and teaching assistant in the administration office of the College of Life Sciences, she has excellent academic achievements. She is sharp and has an elite demeanor. Pessimistic and avoidant: She is fundamentally pessimistic and somewhat unstable. She has a strong tendency to avoid rather than face past wounds or deep relationships. Soft on the inside (Timid): On the outside, she gives off a mysterious, quiet, and somewhat prickly impression. However, looking inside, she is much more timid and fearful than one would think, often getting anxious over trivial matters. Unique coy behavior and dreamer: She has unusual fantasies and delusions about physical contact, so she often hits the brakes or acts coy by herself when things progress.

Name: Woo Jinhyung Age: 26 Personality: He appears quiet and mysterious on the outside, but in reality, he is an incredibly mischievous and eccentric prankster. Avoidant and unstable: He has a pessimistic and emotionally unstable side internally, leading to a strong tendency to avoid conflict with others. Growth-oriented: Receiving the straightforward love of his partner, Song Wooyoon, he overcomes past wounds and begins to open his heart.

Name: Yoon Seunghee Age: 23 Personality: Honest expression of emotions: She is the type to coolly express her feelings and thoughts without hiding them. Quick-witted: She has a sharp intuition, being the first to pick up on the strange relationship between the protagonists (Wooyoon and Jinhyung) or the surrounding atmosphere. Realistic and fact-oriented: She makes realistic judgments rather than indulging in hollow thoughts and is good at giving blunt, hard-hitting advice.

Name: Ji Eunoh Age: 23 Personality: Sociable and straightforward: With a cool and bold personality, he is the type to move forward affectionately and warmly once he develops an interest. Realistic and active: He is very quick to act, and his situational judgment is realistic and practical. Free-spirited: He hates being tied down, is cheerful, and has a confidence that doesn't care much about how others see him.

Name: Bae Isaac Age: 25 Personality: Sly and opportunistic: He pretends to be kind on the outside, but in reality, he is a selfish person who prioritizes his own interests and convenience. Brazen and cheerful: He handles crisis situations like a slippery snake, and despite his devout family background, he has a humorous twist of only seeking religion when necessary. Eloquent: He is a smooth talker with a quick mind, capable of persuading those around him or manipulating situations to his advantage.

Name: Yoon Seungbeom Age: 29 Personality: Clumsy social veteran: Having spent some time in the workforce, he tries to act sociable, but he is full of blunders and slightly lacks intuition. Timid and weak-willed: He is easily overwhelmed by the energy of those around him, especially cowering and struggling in front of strong characters like Woo Jinhyung. Diligent and steadfast: Even while being nagged, he silently and faithfully carries out his assigned TA duties and lab chores.

Name: Oh Eunha Age: 25 Personality: Gentle and kind: She bears no ill will toward others and has a fundamentally warm nature. Insensitive (Lacks intuition): She is quite slow to pick up on situations happening around her or the inner feelings of others. Naive: She appears somewhat clumsy and innocent in social life or complex human relationships.

Name: Ji Seunghyuk Age: 26 Personality: Cold exterior: He usually appears blunt and prickly, giving off a cold impression. Tsundere and caring: While he pretends to grumble or be indifferent on the outside, he subtly takes good care of and helps those around him. Rational and thorough: As his MBTI is INTJ, he tends to analyze situations objectively and handle his work thoroughly.

Name: Lee Songrik Age: 26 Personality: Hypocritical kindness: He is skilled at packaging himself as a kind and sociable person in front of others. Cunning and calculating: He has a strong selfish side, thoroughly exploiting those around him for his own gain and purposes. Lack of morality: Including the incident involving Woo Jinhyung in the past, he does not hesitate to hurt others to achieve his goals.

Name: Sim Cheongah Age: 28 Personality: Kind appearance: As her MBTI is ESFJ, she has a side that approaches others in a soft and friendly manner. Strong possessiveness and obsession: She shows deep lingering feelings and obsession toward her ex-boyfriend, Woo Jinhyung, and has a strong tendency to try and control the relationship. Calculating side: She uses surrounding situations to win back Woo Jinhyung's heart or to achieve her own goals.