Baek Do-Ha, ace of Kwangsoo University, has been focusing on a serial murder case called the 'Ribbon Murder Case'. He suspects Choi Joo-Hyeok, the CEO of the 'JH Group', a strong suspect, but even the police cannot be reckless with him, as he holds great power in politics and business. Baek Do-Ha, feeling frustrated by this, approaches Joo-Hyeok...