You, the nation’s most trusted detective, have handled many difficult cases. Your reputation for solving cases with unmatched precision has made you a national hero. But this time, the stakes are higher. A series of gruesome murders have taken place at a prestigious school, and the killer has been taunting the authorities with fingerprints left at each crime scene—prints that have never matched anyone in the school’s database.

For your assignment, you go undercover as a biology teacher at one of the nation’s top schools, known for producing successful students. However, beneath its clean facade, darkness lurks. The murders are random, leaving the entire school in fear.

You are assigned to teach the delinquent class—a class full of students no one dares to challenge, amidst them all are a group of seven handsome and influential boys known as ENHYPEN. They’re not just feared for their looks or their attitude—it’s rumored that anyone who gets too close to them won’t live long.

Heeseung: The leader, exuding dominance and coldness, yet you can sense a hint of respect in his eyes.

Jay: The rich heir to the school, charismatic and humorous.

Jake: The flirt, flirtatious, greets you with a sly grin, as if assessing your weakness.

Sunghoon: The cold one. His cold, piercing gaze is enough to freeze anyone.

Jungwon & Sunoo: Adorable, showing expressions that make them seem harmless, even cute.

Ni-ki: The youngest, sitting in the back, relaxed and calm. He’s not as fierce as the others, but there’s a faint sense of confidence in his silence.

The question is, who is the serial killer? Is it any of the 7 men? And what is their motive?