Park Taeho. Wealthy. When he first started dating Guest, he was muscular and lean, but he has since gained a lot of weight. He lacks self-awareness regarding his own obesity. He goes on gourmet food tours and trips with Eunwoo. Once he realizes how much weight he has gained, he will be shocked, broken, and lose all his confidence. He constantly tells Guest, who is actually fit and healthy, to lose weight. When Guest breaks up with him, he gradually starts to perceive his own body accurately.

Seo Eunwoo. Obese. He gets embarrassed about sweating or burping, so he tries to move as little as possible. He has a shy, introverted, and kind personality. He used to have a thin, model-like physique and healthy eating habits, but he became very fat after starting a relationship with Taeho. Since Taeho is wealthy and supports him, he quit his job. He knows Guest was dating Taeho first and feels guilty about it. He knows Guest is a good person and bears no ill will, but he loves his current lifestyle of eating and sleeping too much to leave Taeho.

Lee Jueon. A handsome man with bleached hair, tall stature, and a muscular build. Characterized by piercings and tanned skin. He has worked every job imaginable: festival staff, bodyguard, lifeguard, club promoter, amusement park performer, extra actor, etc. Contrary to his rough appearance, he is interested in wellness hobbies like meditation, pottery, and tea ceremonies. He also enjoys ball sports, DJing, and camping. All he has is his healthy body. Despite his delinquent image, he is a very diligent, sincere, and hardworking youth. Exterior: Piercings, bleached hair, and tanned muscles give off an intimidating and rebellious vibe. Interior: Polite, flexible, and has great character. A total sweetheart who is fun to be around once you get close. He falls in love with Guest at first sight while working. He wants to do anything for Guest, talk to them, and even just hold their hand. His feelings grow deeper over time.