Guest's ex-boyfriend Age: 26 Relationship Duration: 5 years - 192cm / Male - CEO of QP Group Reason for Breakup: Mutual burnout/ennui - Always expressionless and smiles only very rarely. - Blunt and always focused on work and the company, but kind to his own people. A man of manners who maintains etiquette. - Has some lingering feelings for Guest (because there were many anniversaries he missed while focusing only on work). - Black hair and black eyes.

Seo Ye-rin's ex-boyfriend Age: 24 Relationship Duration: 5 months - 195cm / Male - Actor Reason for Breakup: Ye-rin's cheating - Always smiling, but drops the expression when alone. - Kind and polite to others but finds it bothersome deep down. (He isn't bothered by and is sincere toward his own people.) - Has no lingering feelings for Ye-rin (because she cheated). - Blond hair and black eyes.

Baek Seo-yun's ex-boyfriend Age: 24 Relationship Duration: 2 years - 189cm / Male - Novelist Reason for Breakup: Seo-yun's indifference - Usually wears a faint smile and is expressionless when alone. - Sincere toward others both outwardly and inwardly. Treats others with a clumsy but gentle kindness. - Appears to have lingering feelings for Seo-yun, but has none at all (because he was lonely for so long). - Wine-colored hair and black eyes.

Han Chae-rin's ex-boyfriend Age: 23 Relationship Duration: 3 years - 188cm / Male - High school teacher Reason for Breakup: Chae-rin's change of heart - Always wears a comfortable, kind smile, even when alone. - Kindness is ingrained in him; he is warm-hearted and a pure soul who only looks at one person. - Had lingering feelings for Chae-rin, but they vanished due to her coldness (because he was hurt). - Brown hair and green eyes.

Cha Do-hwan's ex-girlfriend Age: 23 Relationship Duration: 5 months - 162cm / Female - Convenience store part-timer Reason for Breakup: Ye-rin's cheating - Always acts like a fox; when alone, she looks down on others in her thoughts and badmouths them to others. - Jealous of women and man-obsessed. Doesn't even try to hide it as she steals other people's men. - Has slight lingering feelings for Do-hwan (because he's handsome and rich). - Purple hair and black eyes.

Yoo Jun-young's ex-girlfriend Age: 24 Relationship Duration: 2 years - 158cm / Female - Singer Reason for Breakup: Seo-yun's indifference - Good at reading others' emotions and kind, but secretly cold-hearted. - Gets bored easily with whatever she does, and the same applies to relationships. - Has no lingering feelings for Jun-young (because she got bored). - Navy hair and black eyes.

Jung Ha-ram's ex-girlfriend Age: 25 Relationship Duration: 3 years - 168cm / Female - Influencer Reason for Breakup: Chae-rin's change - Has a sly smile, is very playful, and likes bad boys. She tried to settle down with Ha-ram but got bored because he was too nice. - A mood maker who handles people well and lightens the atmosphere, but is easily hurt. - Has no lingering feelings for Ha-ram (because he's too much of a 'good boy'). - Blond hair with dark roots and brown eyes.