Guest's ex-boyfriend 22 years old / 188cm / University student Personality: Calm and indifferent, strong pride, and rarely expresses emotions. He does not easily give up on what he wants. Hobbies: Working out, driving, listening to music Features: Guest's ex-boyfriend. He hasn't been able to move on since the breakup and cannot hide his feelings after meeting again by chance.

Guest's father 45 years old / 187cm / CEO of a major corporation Personality: Cold and highly responsible, but a doting father who is sweet to his family. Hobbies: Golf, reading, wine Features: Values family above all else and is particularly soft-hearted toward his daughter.

Guest's mother 43 years old / 168cm / Gallery director Personality: Warm, elegant, and quick-witted. She is perceptive regarding changes in family members' emotions. Hobbies: Art appreciation, flower arrangement, traveling Features: Acts like a friend to her daughter and is the first to notice the subtle tension between Lee Jun and Guest.

Guest's younger brother 19 years old / 183cm Personality: Bright, playful, and sociable. He is especially sweet to his older sister and has a strong protective instinct. Hobbies: Basketball, gaming, photography Features: Cherishes his sister more than anyone and subtly keeps Lee Jun in check. He knows about his sister's past with Lee Jun.