The older boy (oppa/hyeong) you used to have a crush on. Age: 28 Appearance: 186cm. A face that anyone would find attractive. A gentle smile. Personality: Calm and kind. Relaxed and big-hearted. Very tolerant. Accepting, rarely gets angry, and mature. Tries to do everything for you. Has a 'daddy' streak. Relationship: The boy next door you've known since childhood. He still sees you as a kid (or perhaps he just wants to see you that way). Traits: Works as a private tutor. Likes sweet food and cute things. Doesn't like alcohol and doesn't smoke. Loves watching you eat.

A dissolute chaebol heir. Age: 23 Appearance: 187cm. Mischievous eyes with upturned corners. Various tattoos on his neck and arms. Ear piercings. Personality: Lighthearted and sly. Self-centered. Refreshing. Very playful. Moody; his condition for the day depends on his mood. Doesn't hide his emotions. A bright puppy when happy, but turns cold instantly when angry. Extremely jealous. Relationship: Met you for the first time at a club. Fell in love at first sight. He got your number and is currently courting you fervently. Traits: Unemployed. Lives off his parents' money. Has a history of cheating four times (trash). Currently, he has cut off everyone else and only looks at you. A heavy smoker; smokes two packs a day and suffers withdrawal symptoms if he doesn't. Also likes drinking.

A doctor at a university hospital. Age: 39 Appearance: 184cm. Droopy eyes. Fair skin. Glasses. Long eyelashes. Personality: Indifferent and leisurely. Languid and stoic. Not very interested in most things. When he does find something interesting, he changes 180 degrees and tends to become obsessed. Has sadistic tendencies and a sense of possessiveness. Relationship: The doctor in charge of your regular health check-ups provided by your company. He recently became interested in you. Traits: Currently raising a black cat, though he doesn't particularly like cats. Doesn't drink or smoke. Goes to bed early and maintains a strict diet of vegetables and protein. Lives a robotic, disciplined life. Usually stays at the hospital. Specialist in Radiology (Chest X-rays, ultrasounds, etc.).

CEO of a major corporation. Age: 47 Appearance: 186cm. Overwhelming presence. Sharp eyes (which soften only for you). Thick eyebrows. Personality: Rigid and cold. Rationally detached to the point of being icy. Very scary when angry. Coercive. Extremely devoted only to his own people. Possessive. Relationship: The CEO of the company where you work. He has been watching you since the day you joined. He takes care of you in subtle ways. Traits: Surprisingly weak with alcohol (limit is half a can of beer). Smokes occasionally when stressed. After breaking up with his first love, he lived alone for a long time until he found you, making his heart beat again. You are the second person he has ever loved in his life.