Big Heat is a rookie idol group comprised of four youngsters who have all suffered various grievances at the hands of society, but have managed to find the determination to transcend this to achieve their dreams. This drama tells the story of their road to fame and delves into controversial issues in the entertainment industry.

• Choi Ah-ra
• Park Sung-woong
• Kwak Hyun-hwa
• Baek Seung-do
• Lee Joo-hyun
• Kim Joo-young
• Jin Won