[MUST WATCH] DETECTIVE 40 MINUTES

Sinopsis :

Da-jeong selalu menyendiri dan membaca buku-buku mengenai detektive, suatu saat teman sekelasnya mengalami keracunaan, tapi Da-jeong  bukannya menolong malah sibuk memprotet kejadian yang menurutnya aneh. Tidak lama Tae-gyu dan Jeong-hun berkelahi karena Tae-gyu menggangu anak perempuan,  Jeong-hun yang menjabat sebagai ketua kelas membela anak perempuan itu dan akhirnya terjadi perkelahian. Akibat perkelahian itu Jeong-hun dan Tae-gyu dihukum pada periode keempat. Pada saat periode keempat Tae-gyu terus saja mengganggu Jeong-hun, sampai akhirnya Jeong-hun seperti ingin membunuh Tae-gyu , tapi niatnya itu ia urungkan. Untuk menenangkan diri ia pergi ke toilet. Saat ia kembali, keadaan Tae-gyu  sudah berllumuran darah, Jeong-hun yang shok malah memegang pisau itu, saat ia sedang memegang ternyata Da-jeong masuk kedalam kelas, tapi Da-jeong tidak percaya bahwa Jeong-hun telah membunuh, akhirnya Da-jeong membantunya untuk menemukan pembunuh sesungguhnya  di bawah 40 menit sebelum periode empat berakhir.

Story:

 Han Jeong-hoon (Yoo Seung-ho) is very popular with the girls but his other schoolfellows also like him. Only Tae-gyu (Jo Sang-geun) and him don't get along well, so that the two eventually have an argument. This is why things don't look too well when Jeong-hoon soon thereafter finds Tae-gyu dead and covered in blood in their classroom. The boy is totally shocked and doesn't know what to do. Luckily, that's when Da-jeong aka "Curtain" (Kang So-ra) enters the classroom. The shy girl, who normally prefers to hide behind her hair and likes to read detective stories, knows exactly what to do and along with Jeong-hoon wants to find the real culprit before the end of the 4th period, as at the moment everything hints at the boy being the murderer. The investigation is making fast progress and this even though the school is being under inspection at the moment, which means that the two have to be careful not to be seen on the corridors. A suspect is found soon, but as time goes by more and more evidence turns up that shifts the case into a new perspective.