A young and handsome detective solves mysteries all over South Korea, and the news reach the C.A.I. Academy. The young detectives dream to be out there too, and they will when they have passed all the test in school.

Lay is a young doctor who help his friends Kai, Luhan, Sehun, D.O and Chen to solve mysteries around their school, until a young and new boy appear, smarter and more handsome than anyone else in school. Lay watch the boy, young, handsome, intelligent and athletic, who is he?

The young handsome boy doesn't talk that much, he's very quiet and gentle, he help people if they ask him and he's cute and has this angel smile, who is he? And what is he doing here with his angelic smile? Many questions spinning around Lay's head, will he ever get an answer?

The story is about Lay who happen to fall in love with a young handsome detective who seems to be just like the famous detective. Lay trying desperate to not show his crazy crush on the handsome new boy, but will he be able to hide his feelings when the cases begin to get dangerous? Will Lay ever get to know the real handsome boy or will he go around, clueless for the rest of his life? And what is the real reason why the boy go to C.A.I.?

This is a Detective fiction!

Zhang Yixing (Lay)
- Is 17 years old boy who going to C.A.I. Academy to learn the medical art.
- He's a good doctor who is cute and never rude, he hates rude and mean people.
- Love to read, dance, listen to music and study all the time when he can.

The Handsome Young Detective (a.k.a Suho)
- Is 17 years old detective who is famous all around the South Korean and even in China and the USA.
- He's a gentle and calm boy, but has problems with handling rude and annoying people who disturb his work. But he always remain calm and manage to solve his case.
- Love to read, solve mysteries all the time, walk in the woods or lay on a flower field.

Things that can be good to know:

"C.A.I.A" means "Criminal And Investigation Academy."

"FBI" means "Federal Bureau of Investigation"

"CIA" means "Central Intelligence Agency"

"CSI" means " Crime Scene Investigation"