Kim Yiwol from Assistant Manager Kim Hates K-Pop Idols is cynical, exhausted, and burdened by past trauma, yet fiercely hardworking.Professional & Cynical: He hides a bitter, depressed outlook under a disciplined, highly professional work ethic shaped by office politics.Resilient: Despite low self-confidence and an intense dislike for idol life, he deeply cares for his bandmates and fights hard for his second chance.

Choi Jeho from Assistant Manager Kim Hates K-Pop Idols is a stoic, quiet, and exceptionally disciplined member of the idol group spArk. He possesses a calm, non-provocative demeanor and a nonchalant yet rigorous teaching style. Diligent and obedient since his school days, he quietly follows rules and completes tasks without taking flamboyant leads, anchoring the group with his steady and composed presence.

Jeong Seongbin from Assistant Manager Kim Hates K-Pop Idols is the dedicated leader of the idol group spArk. He has a bright, radiant smile and a deeply caring nature, often worrying over his members. Hardworking and passionate, he throws himself entirely into practice with joyful energy. Despite his bright exterior, he carries a strong sense of responsibility and grows rapidly into a capable, confident leader who deeply values his team.

Lee Cheonghyeon from Assistant Manager Kim Hates Idols is sharp, talented, and quietly mischievous.He is over 180cm tall with a striking, intense appearance, but he possesses smooth social skills, dry wit, and a knack for teasing. He contributes deeply to the group's music with his self-composed tracks, balancing a cool exterior with a playful, sharp personality behind the scenes.

Kang Kiyeon (often referred to as Kim Iwol) from Assistant Manager Kim Hates Idols has an exhausted, cynical, yet fiercely responsible personality.Weary Salaryman Mindset: Armed with a dry, cynical outlook and deep-seated labor law survival instincts.Hidden Care/Nagging: Acts like an overbearing, strict mother or "Grim Reaper" who constantly nags, yet meticulously looks out for everyone.Traumatized & Resilient: Carries heavy past burdens with a low emotional display, surviving through sheer grit.

Park Joowoo (Jeowoo) from Assistant Manager Kim Hates K-Pop Idols is deeply selfless, empathetic, and professional.Yielding & Humble: He consistently steps back, lacks personal greed, and willingly passes up spotlight opportunities for his spArk bandmates.Caring Confidant: He prioritizes others, constantly checking on his friends' well-being despite his own extreme exhaustion.Resilient: He maintains a carefree, gentle attitude during intense schedules